Publications

Reviewed Scientific Publications

  1. V. Gomer, F. Strauch, B. Überholz, S. Knappe, D. Meschede, Single-atom dynamics revealed by photon correlations, Phys. Rev. A, 58, R1657-R1660 (1998).

  2. V. Gomer, B. Überholz, S. Knappe, F. Strauch, D. Frese, D. Meschede, Decoding the dynamics of a single trapped atom from photon correlations, Appl. Phys. B 67, 689-697 (1998).

  3. C. Affolderbach, A. Nagel, S. Knappe, C. Jung, D. Wiedenmann, R. Wynands, Nonlinear spectroscopy using a vertical-cavity surface-emitting laser (VCSEL), Appl. Phys. B 70, 407-413 (2000).

  4. A. Nagel, C. Affolderbach, S. Knappe, R. Wynands, Influence of excited state hyperfine structure on ground state coherence, Phys. Rev. A 61, 012504 (2000).

  5. S. Knappe, W. Kemp, C. Affolderbach, A. Nagel, R. Wynands, Splitting of coherent population trapping resonances by the nuclear magnetic moment, Phys. Rev. A 61, 012508 (2000).

  6. J. Kitching, S. Knappe, N. Vukićević, L. Hollberg, R. Wynands, W. Weidemann, A microwave frequency reference based on VCSEL-driven dark line resonances in Cs vapor, IEEE Trans. Instrum. Meas. 49, 1313-1317, (2000).

  7. S. Knappe, R. Wynands, J. Kitching, H. G. Robinson, L. Hollberg, Characterization of coherent population trapping resonances as atomic frequency references, J. Opt. Soc. Am. B 18, 1545-1553 (2001).

  8. M. Stähler, S. Knappe, C. Affolderbach, W. Kemp, R. Wynands, Picotesla magnetometry with coherent dark states, Europhys. Lett. 53, 323-328 (2001).

  9. J. Kitching, H. G. Robinson, L. Hollberg, S. Knappe, R. Wynands, Optical pumping noise in laser-pumped, all-optical microwave frequency references, J. Opt. Soc. Am. B 18, 1676-1683 (2001).

  10. J. Kitching, L. Hollberg, S. Knappe, R. Wynands, Frequency-dependent optical pumping effects in atomic Λ-systems, Opt. Lett. 26,1507-1509 (2001).

  11. J. Kitching, L. Hollberg, S. Knappe, R. Wynands, A compact atomic clock based on coherent population trapping, Electron. Lett.37, 1449-1451 (2001).

  12. S. Knappe, J. Kitching, L. Hollberg, R. Wynands, Temperature dependence of coherent population trapping resonances, Appl. Phys. B 74, 217-222 (2002).

  13. C. Affolderbach, S. Knappe, A. V. Taichenachev, V. I. Yudin, R. Wynands, Electromagnetically induced transparency and absorption in a standing wave, Phys. Rev. A 65, 043810 (2002).

  14. M. Stähler, R. Wynands, S. Knappe, J. Kitching, L. Hollberg, A. Taichenachev, V. Yudin, Coherent population trapping resonances in thermal 85Rb vapor: D1 versus D2 line excitation, Opt. Lett. 27, 1472-1474 (2002).

  15. C. Affolderbach, M. Stähler, S. Knappe, R. Wynands, An all-optical, high-sensitivity magnetic gradiometer, Appl. Phys. B, published on-line on Nov. 15, 2002.

  16. J. Kitching, S. Knappe, L. Hollberg , Miniature vapor-cell atomic frequency references, Appl. Phys. Lett. 81, 553-555 (2002).

  17. S. Knappe, M. Stähler, C. Affolderbach, A. V. Taichenachev, V. I. Yudin, R. Wynands, Simple parametrization of dark-resonance line shapes, Appl. Phys. B 76, 57-63 (2003) .

  18. S. Knappe, V. Velichansky, H.G. Robinson, J. Kitching, L. Hollberg, Compact atomic vapor cells fabricated by laser-induced heating of hollow-core glass fibers, Rev. Sci. Instum. 74, 3142-3145 (2003).

  19. S. Knappe, L. Hollberg, J. Kitching, Dark Line Resonances in Sub-Millimeter Structures, Opt. Lett. 29, 388-390 (2004).

  20. L.-A. Liew, S. Knappe, J. Moreland, H. Robinson, L. Hollberg, J. Kitching, Microfabricated Alkali Atom Vapor Cells, Appl. Phys. Lett. 84, 2694-2696 (2004).

  21. S. Knappe, V. Shah, P. Schwindt, L. Hollberg, J. Kitching, L.-A. Liew, J. Moreland, A Microfabricated Atomic Clock, Appl. Phys. Lett. 85, 1460-1462 (2004).

  22. P. D. D. Schwindt, S. Knappe, V. Shah, L. Hollberg, J. Kitching, L.-A. Liew, J. Moreland, A Chip-Scale Atomic Magnetometer ,Appl. Phys. Lett. 85, 6409-6411 (2004).

  23. S. Knappe, P. D. D. Schwindt, V. Shah, L. Hollberg, J. Kitching, L. Liew, J. Moreland, A chip-scale atomic clock based on 87Rb with improved frequency stability, Opt. Express 14, 1249-1253 (2005).

  24. S. Knappe, V. Gerginov, P. Schwindt, V. Shah, L. Hollberg and J. Kitching, Atomic vapor cells for chip-scale atomic clocks with improved long-term frequency stability, Opt. Lett. 30, 2351-2354 (2005).

  25. V. Gerginov, S. Knappe, P. Schwindt, V. Shah, L.W. Hollberg and J. Kitching, Long-term frequency instability of CPT clocks with microfabricated vapor cells, J. Opt. Soc. Am. B 23, 593-597 (2006).

  26. M. Rosenbluh, V. Shah, S. Knappe, and J. Kitching, Differential Coherent Population Trapping Resonances Excited by Orthogonally Polarized Laser Fields, Opt. Expr. 14, 6588-6594 (2006).

  27. V. Shah, S. Knappe, P. Schwindt, V. Gerginov, and J. Kitching, Compact phase delay technique for increasing the amplitude of coherent population trapping resonances in open Lambda systems, Opt. Lett. 31, 2335-2337 (2006).

  28. S. Knappe, P. Schwindt, V. Gerginov, V. Shah, H.G. Robinson, L. Hollberg, L. Liew and J. Moreland, Microfabricated atomic clocks and magnetometers, J. Opt. A, Special Issue: Optical MEMS, S318-S322 (2006).

  29. V. Gerginov, V. Shah, S. Knappe, L.W. Hollberg and J. Kitching, Atom-based stabilization for laser-pumped atomic clocks, Opt. Lett. 31, 1851-1853 (2006).

  30. Y. Wang, M. Eardley, S. Knappe, J.M. Moreland, L. Hollberg, and J. Kitching, Magnetic resonance in atomic vapor excited by a mechanical resonators, Phys. Rev. Lett. 97, 227602 (2006).

  31. V. Shah, V. Gerginov, P.D. Schwindt, S. Knappe, L. Hollberg, and J. Kitching, Continuous Light Shift Correction in Modulated CPT Clocks, Appl. Phys. Lett. 89, 151124 (2006).

  32. P.D. Schwindt, B. Lindseth, S. Knappe, V. Shah, J. Kitching, and L. Liew, A chip-scale atomic magnetometer with improved sensitivity using the Mx technique, Appl. Phys. Lett. 90, 081102 (2007).

  33. S. Knappe, H.G. Robinson, L. Hollberg, Microfabricated Saturated Absorption Spectroscopy, Opt. Expr. 15, 6293-9 (2007).

  34. V. Shah, S. Knappe, L. Hollberg, J. Kitching, High contrast coherent population trapping resonances using four-wave mixing in 87Rb, Opt. Lett., 32, 1244-6 (2007).

  35. V. Gerginov, V. Shah, S. Knappe, L. Hollberg, J. Kitching, Laser noise cancellation in single-cell CPT clocks, IEEE Trans. Instrum. Meas., 57, 1357-1361 (2007).

  36. V. Shah, S. Knappe, P.D. Schwindt, L. Hollberg, and J. Kitching, Subpicotesla atomic magnetometry with a microfabricated vapor cell, Nature Photonics 1, 649-652 (2007).

  37. M.P. Ledbetter, I.M. Savukov, D. Budker, V. Shah, S. Knappe, J. Kitching, D. Michalak, S. Xu, and A. Pines, Zero-field remote detection of NMR with a microfabricated atomic magnetometer, Proc. Natl. Acad. Sci. U.S.A., 105, 2286-2290 (2008).

  38. E.J. Eklund, A.M. Shkel, S. Knappe, E.A. Donley, and J. Kitching, Glass-blown spherical microcells for chip-scale atomic devices, Sensors and Actuators A: Physical, 143, 175-180 (2008).

  39. Y.W. Yi, H.G. Robinson, S. Knappe, J. Maclennan, C.D. Jones, C. Zhu, N.A. Clark, and J. Kitching, Method for characterizing self-assembled monolayers as antirelaxation wall coatings for alkali vapor cells, J. Appl. Phys. 104, 023534 (2008).

  40. K. Watabe, T. Ikegami, A. Takamizawa, S. Yanagimachi, S. Ohshima and S. Knappe, High-contrast Dark Resonance in Bichromatic Linearly Polarized Optical Field on Cs D1 Line, Appl. Opt. 48, 1098-1103 (2009).

  41. W.C. Griffith, R. Jimenez, S. Knappe, and J. Kitching, V. Shah, Miniature atomic magnetometer integrated with flux concentrators, Appl. Phys. Lett. 94, 023502 (2009).

  42. D.M. Rampulla, N. Oncel, E. Abelev, Y. Yi, S. Knappe, and S. Bernasek, Effects of Organic Film Morphology on the Formation of Rb Clusters on Surface Coatings used in Alkali Metal Atom Magnetometer Cells, Appl. Phys. Lett 94, 041116 (2009).

  43. M.P. Ledbetter, C.W. Crawford, A. Pines, D.E. Wemmer, S. Knappe. J. Kitching, and D. Budker, Optical detection of scalar coupling at zero magnetic field, J. Mag. Res. 199, 25-9 (2009).

  44. M.A. Perez, U. Nguyen, S. Knappe, E.A. Donley, J. Kitching, and A.M. Shkel, Rubidium Vapor Cell with Integrated Bragg Reflectors for Compact Atomic MEMS, Sens. and Act., 154, 295-303 (2009).

  45. R. Jimenez, W.C. Griffith, Y. Wang, S. Knappe, J. Kitching, K. Smith, and M. Prouty, Sensitivity Comparison of Mx and Frequency Modulated Bell-Bloom Cs Magnetometers in a Micro-Fabricated Cell, IEEE Trans. Instrum. Meas. 59, 372 (2010).

  46. R. Jimenez, W.C. Griffith,, S. Knappe, J. Kitching, Conversion of laser frequency noise to optical rotation noise in a Cs vapor cell, Opt. Lett. 34, 2519 (2009).

  47. S. Knappe, H. Robinson, Double-resonance lineshape in a cell with wall coating and buffer gas, New Journal of Physics 12, 065021 (2010).

  48. S. Knappe, T.H. Sander, O. Kosch, F. Wiekhorst, J. Kitching and L. Trahms, Cross-validation of microfabricated atomic magnetometers with superconducting quantum interference devices for biomagnetic applications, Appl. Phys. Lett. 97, 133703-3 (2010).

  49. W.C. Griffith, S. Knappe, and J. Kitching, Femtotesla atomic magnetometry in a microfabricated vapor cell, Opt. Exp. 18, 27167-27172 (2010).

  50. C. Lee, G.Z. Iwata, E. Corsini, J.M. Higbie, S. Knappe, M.P. Ledbetter, and D. Budker, Small-sized Dichroic Atomic Vapor Laser Lock (DAVLL), Rev. Sci. Instrum. 82, 043107 (2011).

  51. T. Theis, P. Ganssle, G. Kervern, S. Knappe, and J. Kitching, M.P. Ledbetter, D. Budker, A. Pines, Parahydrogen-enhanced zero-field nuclear magnetic resonance, Nature Physics 7, 571-575 (2011).

  52. J. Kitching, S. Knappe, and E. Donley, Atomic Sensors - A review, J. IEEE Sensors 11, 1749-1758 (2011).

  53. D. Maser, S. Pandey, H. Ring, M. P. Ledbetter, S. Knappe, J. Kitching, and D. Budker, Detection of a single cobalt microparticle with a microfabricated atomic magnetometer, Rev. Sci. Instrum. 82, 086112 (2011).

  54. T.H. Sander, J. Preusser, R. Mhaskar, J. Kitching, L. Trahms, and S. Knappe, Magnetoencephalography with a chip-scale atomic magnetometer, Biomed. Opt. Express 3, 981-990 (2012).

  55. R. Jimenez, S. Knappe, J. Kitching, and M. Prouty, High-bandwidth optical magnetometer, J. Opt. Soc. Am B 29, 3398-3403 (2012).

  56. L. Weller, K. Kleinbach, M. Zentile, S. Knappe, I. Hughes, and C. Adams, An optical isolator using an atomic vapor in the hyperfine Paschen-Back regime, Opt. Lett. 37, 3405-3407 (2012).

  57. L. Weller, K. Kleinbach, M. Zentile, S. Knappe, I. Hughes, and C. Adams, Absolute absorption and dispersion of a rubidium vapour in the hyperfine Paschen-Back regime, J. Phys. B 45, 215005 (2012).

  58. R. Mhaskar, S. Knappe, and J. Kitching, A low-power high-sensitivity micromachined optical magnetometer, Appl. Phys. Lett. 101, 241105 (2012).

  59. M. Zentile, R. Andrews, L. Weller, S. Knappe, C. Adams and I. Hughes, The hyperfine Paschen-Back Faraday effect, J. Phys. B. 47, 075005 (2014)..

  60. R. Jiménez-Martínez, D.. Kennedy, M. Rosenbluh, E. Donley, S. Knappe, S. Seltzer, H. Ring, V. Bajaj, and J. Kitching, Optical hyperpolarization and NMR detection of 129Xe on a microfluidic chip, Nature Communications 5, 3908 (2014). doi:10.1038/ncomms4908

  61. R. Jimemez, S. Knappe, and J. Kitching, An optically modulated zero-field atomic magnetometer with suppressed spin-exchange broadening, Rev. Sci Instrumen. 85, 045124 (2014).

  62. P.J. Ganssle, H.D. Shin, S.J. Seltzer, V.S. Bajaj, M.P. Ledbetter, D. Budker, S. Knappe, J. Kitching, and A. Pines, Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer.” Angewandte Chemie International Edition (cover article), July 31, 2014. doi:10.1002/anie.201403416.

  63. O. Alem, A. Benison, D. Barth, J. Kitching, and S. Knappe, Magnetoencephalography of epilepsy with a microfabricated atomic magnetrode, J. Neuroscience 34, 14324-27 (2014).

  64. O. Alem, T.H. Sander, R. Mhaskar, J. LeBlanc, H. Eswaran, U. Steinhoff, Y. Okada, J. Kitching, L. Trahms, and S. Knappe, Fetal magnetocardiography measurements with an array of microfabricated optically-pumped magnetometers, Phys. Med. Biol. 69, 4797-4811 (2015).

  65. A. Dellis, V. Shah, E. Donley, S. Knappe, J. Kitching, Low helium permeation cells for atomic microsystems technology, Opt. Lett. 41, 2775-8 (2016).

  66. D. Kennedy, S. Seltzer, R. Jimenez-Martinez, B. Patton, H. Ring, N. Malecek, S. Knappe, E. Donley, J. Kitching, V. Bajaj, and A. Pines, An optimized microfabricated platform for the optical generation and detection of hyperpolarized129Xe, Scientific Reports 7, 43994 (2017).

  67. E. Boto, S. Meyer, V. Shah, O. Alem, S. Knappe, P. Kruger, M. Fromhold, M. Lim, P. Glover, P. Morris, R. Bowtell, G. Barnes, M. Brookes, A New Generation of Magnetoencephalography: Room Temperature Measurements using Optically-Pumped Magnetometers, NeuroImage,149, 404 (2017).

  68. D. Sheng, A. Perry, S. Krzyzewski, S. Geller, J. Kitching, S.Knappe, A microfabricated optically-pumped magnetic gradiometer, Appl. Phys. Lett. 110, 031106 (2017)

  69. O. Alem, R. Mhaskar, R. Jimenez-Martinez, D. Sheng, J. LeBlanc, L. Trahms, T. Sander, J. Kitching, S. Knappe, Magnetic field imaging with microfabricated optically-pumped magnetometers, Optics Express 25, 282368 (2017).

  70. V. Gerginov, S. Krzyzewski, S. Knappe, A Pulsed operation of a miniature scalar optically pumped magnetometer, Journal of the Optical Society of America B 34, 1429-1434 (2017)

Other Scientific Publications

  1. J. Kitching, N. Vukicevic, L. Hollberg, S. Knappe, C. Affolderbach, R. Wynands, and W. Weidemann, Microwave Frequency Reference Based on VCSEL-Driven Dark Line Resonances in Cs Vapor, Proc. 2000 IEEE International Frequency Control Symposium (FCS).

  2. J. Kitching, H.G. Robinson, L. Hollberg, S. Knappe, and R. Wynands, Compact Microwave Frequency Reference Based on Coherent Population Trapping, Proc. 2001 Frequency Standards Metrology Symposium.

  3. J. Kitching, S. Knappe, and L. Hollberg, Performance of Small Scale-Frequency References, Proc. 2002 IEEE International Frequency Control Symposium (FCS).

  4. S. Knappe, V. Velichansky, H.G. Robinson, L. Liew, J. Moreland, J. Kitching, and L. Hollberg, Atomic Vapor Cells for Miniature Frequency References, Proc. 2003 Joint Mtg. IEEE International Frequency Control Symposium (FCS) and European Frequency and Time Forum (EFTF).

  5. J. Kitching, S. Knappe, L. Liew, J. Moreland, S. Kargopoltsev, V. Velichansky, H.G. Robinson, and L. Hollberg, Ultra-small atomic clocks based on coherent population trapping and micromachined vapor cells, Proc. 2003 International Conference on Laser Spectroscopy (ICOLS).

  6. L. Liew, S. Knappe, J.M. Moreland, H.G. Robinson, L. Hollberg, and J. Kitching, Micromachined Alkali Atom Vapor Cells For Chip-Scale Atomic Clocks, Proc. 2004 International Conference Microelectromechanical Systems (MEMS)

  7. J. Kitching, S. Knappe, L. Liew, J. Moreland, H.G. Robinson, P. Schwindt, V. Shah and L. Hollberg, Microfabricated Atomic Frequency References, Proc. 2004 European Frequency and Time Forum (EFTF).

  8. S. Knappe, P. Schwindt, V. Shah, L. Hollberg, J. Kitching, L. Liew, and J. Moreland, Microfabricated Atomic Frequency References, Proc. 2004 IEEE UFFC Joint 50th Anniv. Conf.

  9. J. Kitching, S. Knappe, L.-A. Liew, P. Schwindt, V. Shah, J. Moreland, and L. Hollberg, Power dissipation in a vertically-integrated chip-scale atomic clock, Proc. 2004 IEEE UFFC Joint 50th Anniv. Conf.

  10. S. Knappe, P. D. D. Schwindt, V. Gerginov, V. Shah, L. Hollberg, J. Kitching, L. Liew, J. Moreland, Microfabricated atomic clocks at NIST, Proc. 2004 Precision Time and Time Interval (PTTI) Mtg.

  11. J. Kitching, S. Knappe, L. Liew, P. Schwindt, V. Shah, J.M. Moreland, L. Hollberg, Microfabricated Atomic Clock, Proc. 2005 IEEE International Conference Microelectromechanical Systems (MEMS).

  12. J. Kitching, S. Knappe, L. Liew, J. Moreland, P. Schwindt, V. Shah, V. Gerginov, L. Hollberg, Microfabricated Atomic Clocks, Metrologia, vol. 42 (3), June 2005

  13. J. Kitching, S. Knappe, L. Liew, J. Moreland, H.G. Robinson, P. Schwindt, V. Shah, V. Gerginov, and L. Hollberg, Chip-Scale Atomic Frequency References: Fabrication and Performance, Proc. 2005 European Frequency and Time Forum (EFTF).

  14. S. Knappe, P. Schwindt, V. Gerginov, V. Shah, H.G. Robinson, L. Hollberg, and J. Kitching, Microfabricated Atomic Clocks and Magnetometers, Proc. 2005 International Conference on Laser Spectroscopy (ICOLS).

  15. J. Kitching, S. Knappe, L. Liew, J. Moreland, H.G. Robinson, P. Schwindt, V. Shah, V. Gerginov, and L. Hollberg, Chip-Scale Atomic Clocks at NIST, Proc. 2005 National Conference of Standards Laboratories International (NCSLI).

  16. V. Gerginov, S. Knappe, P. Schwindt, V. Shah, L. Liew, J.M. Moreland, H.G. Robinson, L. Hollberg, J. Kitching, A. Brannon, J. Breitbarth, and Z. Popovic, Component-Level Demonstration of a Microfabricated Atomic Frequency Reference, Proc. 2005 Joint Mtg. IEEE International Frequency Control Symposium (FCS) and Precision Time and Time Interval (PTTI) Mtg.

  17. J. Kitching, S. Knappe, L. Liew, P. Schwindt, V. Gerginov, V. Shah, J. Moreland, A. Brannon, J. Breitbarth, Z. Popovic, and L. Hollberg, Chip-Scale Atomic Frequency References, Proc. 2005 Institute Of Navigation Global Navigation Satellite Syaytems (ION GNSS) Mtg.

  18. J. Moreland, J. Kitching, P. D. D. Schwindt, S. Knappe, L. Liew, V. Shah, V. Gerginov, Y.-J. Wang, and L. Hollberg, Chip-Scale Atomic Magnetometers, Meeting of the Military Sensing Symposia (MSS) Specialty Group on Battlefield Acoustic and Seismic Sensing, Magnetic and Electric Field Sensors (BAMS), Laurel, MD, 2005.

  19. S. Knappe, P. Schwindt, L. Hollberg, J. Kitching, V. Shah and V. Gerginov, Performance of Chip-Scale Atomic Clocks, Proc. 2005 Quantum Electronics and Laser Science Conference (QELS), 479-481.

  20. P. Schwindt, S. Knappe, V. Shah, L. Hollberg, J. Kitching, L. Liew, and J. Moreland, Microfabricated Atomic Magnetometers, Proc. 2005 IEEE Sensors Conference, 73-76.

  21. J. Kitching, S. Knappe, P. Schwindt, Y. Wang, H.G. Robinson, L. Hollberg, L. Liew, J.M. Moreland, A. Brannon, J. Breitbath, B. Lindseth, Z. Popovic, V. Shah, V. Gerginov, and M. Eardley, Chip-Scale Atomic Devices, 2006 Solid State Sensors, Actuators, and Microsystems Workshop.

  22. V. Gerginov, V. Shah, S. Knappe, L. Hollberg, and J. Kitching, Atom-based stabilization for laser-pumped atomic clocks, Proc. 2006 European Frequency and Time Forum (EFTF).

  23. V. Shah, P.D. Schwindt, V. Gerginov, S. Knappe, L. Hollberg, and J. Kitching, Active light-shift stabilization in modulated CPT clocks, Proc. 2006 International Frequency Control Symposium (FCS).

  24. A. Brannon, J. Breitbarth, Z. Popovic, V. Gerginov, V. Shah, S. Knappe, L. Hollberg, and J. Kitching, A Local Oscillator for Chip-Scale Atomic Clocks at NIST, Proc. 2006 International Frequency Control Symposium (FCS).

  25. S. Knappe, P.D. Schwindt, V. Gerginov, V. Shah, A. Brannon, B. Lindseth, L. Liew, H.G. Robinson, J.M. Moreland, Z. Popovic, L. Hollberg and J. Kitching, Chip scale atomic devices at NIST, Proc. 2006 International School of Quantum Electronics (ISQE).

  26. V. Gerginov, S. Knappe, V. Shah, J. Kitching, and L. Hollberg, Laser noise cancellation in single-cell CPT clocks, Proc. 2006 International School of Quantum Electronics (ISQE).

  27. A. Brannon, V. Gerginov, S. Knappe, J. Kitching, Z. Popovic, System-Level Integration of a Chip-Scale Atomic Clock: Microwave Oscillator and Physics Package, Proc. 2006 IEEE Multiconference on Electronics and Photonics.

  28. S. Knappe, V. Gerginov, V. Shah, A. Brannon, H.G. Robinson, L. Hollberg, and J. Kitching, Long-term Stability of Chip-Scale Atomic Clock Physics Packages, SPIE Proc. 2007 Optics and Photonics (Photonics West).

  29. S. Knappe, V. Shah, V. Gerginov, A. Brannon, L. Hollberg and J. Kitching, Long-term Stability of NIST Chip-Scale Atomic Clock Physics Package, Proc. 2006 Precise Time and Time Interval Meeting (PTTI).

  30. A. Brannon, V. Gerginov, V. Shah, S. Knappe, Z. Popovic, L. Hollberg and J. Kitching, Self-Injection Locking of a Low-Power Microwave Oscillator by Using 4-Wave Mixing in an Atomic Vapor, Proc. 2007 International Frequency Control Symposium (FCS) and European Frequency and Tine Forum (EFTF), 275-278.

  31. V. Shah, S. Knappe, L. Hollberg, J. Kitching, Generation of coherent population trapping resonances with nearly 100 % transmission contrast, Proc. 2007 International Frequency Control Symposium (FCS) and European Frequency and Tine Forum (EFTF), 1339-1341.

  32. S. Knappe, V. Shah, A. Brannon, V. Gerginov, H.G. Robinson, Z. Popovic, L. Hollberg and J. Kitching, Advances in Chip-Scale
    Atomic Frequency References at NIST, Proc. 2007 SPIE Conf., 6673.

  33. E. J. Eklund, A. M. Shkel, S. Knappe, E. Donley, J. Kitching, Spherical Rubidium Vapor Cells Fabricated by Micro Glass Blowing,
    Proc. IEEE MEMS 2007, pp. 171-174, Kobe, Japan, January 21-25, 2007.

  34. M.P. Ledbetter, I.M. Savukov, D. Budker, V. Shah, S. Knappe, J. Kitching, S. Xu, D. Michalak, and A. Pines, Optical Microchip
    Detection of Nuclear Magnetic Resonance, Proc. 2008 Conf. Lasers and Electro-Optics.

  35. K. Watabe, T. Ikegami, A. Takamizawa, S. Yanagimachi, S. Ohshima, S. Knappe, Dark Resonance in Bichromatic Linearly Polarized
    Optical Field on Cs D1 Line, Proc. 2008 Intl. Freq. Cont. Symp., 107-9

  36. J. Kitching, S. Knappe, V. Shah, P.D. Schwindt, W.C. Griffith, R. Jimenez, J. Preusser, L.A. Liew, and J.M. Moreland,
    Microfabricated Atomic Magnetometers and Applications, Proc. 2007 IEEE Intl. Freq. Cont. Symp., 789-794.

  37. W.C. Griffith, R. Jimenez, V. Shah, S. Knappe, and J. Kitching, Improved Sensitivity of a Miniature Atomic Magnetometer by use
    of Magnetic Flux Concentrators, Proc. 2008 Europ. Magnetic Sensors and Actuators Conference (EMSA).

  38. J. Preusser, V. Gerginov, S. Knappe, and J. Kitching, A microfabricated photonic magnetometer, Proc. 2008 IEEE Sensors.

  39. M.A. Perez, U. Nguyen, S. Knappe, E. Donley, J. Kitching, A.M. Shkel, Rubidium Vapor Cell with Integrated Nonmetallic
    Multilayer Reflectors, Proc. IEEE MEMS 2008, pp. 790-793, Tucson, AZ, USA, January 13-17, 2008.

  40. J. Kitching, S. Knappe, E.A. Donley, Y.J. Wang, E. Hodby, W.C. Griffith, A. Geraci, J. Preusser, T.C. Liebisch, H.G. Robinson, L.
    Hollberg, P.D. Schwindt, V. Gerginov, B. Lindseth, M. Eardley, R. Jimenez, and V. Shah, Chip-scale atomic devices: precision
    atomic instruments based on MEMS, Proc. 2008 7th Symposium on Frequency Standards and Metrology.

  41. J. Preusser, S. Knappe, J. Kitching, V. Gerginov, A microfabricated photonic magnetometer, Proc. 2009 European Frequency
    and Time Forum jointly with International Frequency Control Symposium, Besancon, France, April 20-23, 2009, pp.
    1180-1182.

  42. J. Preusser, S. Knappe, J. Kitching, and V. Gerginov, A microfabricated photonic magnetometer, Proc. 2009 Joint Mtg. IEEE
    Intl. Freq. Cont. Symp. and EFTF Conf., pp. 1180-1182, 2009

  43. J. Kitching, S. Knappe, W.C. Griffith, J. Preusser, V. Gerginov, P.D. Schwindt, V. Shah, R. Jimenez, Uncooled, Millimeter-Scale
    Atomic Magnetometers with Femtotesla Sensitivity, Proc. 2009 IEEE Sensors Conf., pp. 1844-1847.

  44. R. Mhaskar, S. Knappe, and J. Kitching, Low-Frequency Characterization of MEMS-based Portable Atomic Magnetometer,
    Proc. 2010 IEEE Intl. Freq. Cont. Symp., pp. 376-379.

  45. H. Korth, K. Strohbehn, F. Tejada, A. Andreou, S. McVeigh, J. Kitching, and S. Knappe, Chip-Scale Absolut Scalar
    Magnetometer for Space Applictions, APL Technical Digest 28, 281 (2010).

  46. S. Knappe, J. Preusser, L. Trahms, and T.H. Sander, Herzschläge durch Laserspektroskopie detektiert: Optische
    Minimagnetometer, Physik in unserer Zeit 1, p. 7 (2011).

  47. S. Knappe, R. Mhaskar, J. Preusser, J. Kitching, L. Trahms, and T. Sander, Chip-scale room-temperature atomic magnetometers for biomedical measurements, Proc. IFMBE 37, 1330-1333 (2011).

  48. A.M. Benison, O. Alem, S. Knappe, J. Kitching, D.S. Barth, A micro-fabricated atomic magnetometer for magnetoencephalography of epilepsy. Program No. 314, Washington, DC: Society for Neuroscience (2014).

  49. S. Knappe, D. Sheng, O. Alem, and J. Kitching, Microfabricatd Optically-Pumped Magnetometers for Biomedical Applications, Proceedings of the Frequency Standards and Metrology Seminar (2015).

  50. J. Kitching, E. Donley, S. Knappe, M. Hummon, A. Dellis, J. Sherman, K. Srinivasan, V. Aksyuk, Q. Di, D. Westly, B. Roxworthy, A. Lal, NIST on a Chip: Realizing SI Units with microfabricated alkali vapor cells, Proceedings of the Frequency Standards and Metrology Seminar (2015).

  51. H. Korth, K. Strohbehn, F. Tejada, A. Andreou, J. Kitcning, S. Knappe, J. Lehtonen, S. London, and M. Kafel, Miniature absolute scalar magnetometer based on rubidium isotope 87Rb, Proceedings of the Measurement Techniques for Solar and Space Physics Conference (2015).

  52. S. Krzyzewski, S. Geller, A. Perry, D. Sheng, J. Kitching, S. Knappe, Chip-Scale Atomic Magnetometer Characterization, Proc. of the 21016 International Frequency Control Symposium.

  53. A. Perry, D. Sheng, S. Knappe, Microfabricated Optically-Pumped Magnetometer Arrays for Biomedical Imaging, Proc. of the SPIE, Photonics West Conference, 2017.

Book Chapters

  • S. Knappe, Emerging Topics: MEMS atomic clocks, in Y. Gianchandani, O. Tabata, and H. Zappe, (eds.) Comprehensive Microsystems, 2007, Elsevier, Netherlands.

  • S. Knappe and J. Kitching, Microfabricated Atomic Magnetometers, in D. Budker, D. F. Jackson Kimball, and M. V. Romalis, (eds.) Optical Magnetometry, Cambridge University Press.

  • S. Knappe, T. Sander and L. Trahms, Chip-Scale Optically-Pumped Magnetometers for MEG, in Selma Supek and Cheryl J. Aine (eds.) Magnetoencephalography: From Signals to Dynamic Cortical Networks, Springer Verlag, Heidelberg, 2014.

  • R. Jimenez-Martinez and S. Knappe, Microfabricated optically-pumped magnetometers in A. Grosz, M. Haji-Sheikh, and S. Mukhopadhyay (eds.) High Sensitivity Magnetometers, Springer Verlag, 2016

  • S. Knappe, T. Sander and L. Trahms, Chip-Scale Optically-Pumped Magnetometers for MEG, in Selma Supek and Cheryl J. Aine (eds.) Magnetoencephalography: From Signals to Dynamic Cortical Networks, Springer Verlag, Heidelberg, 2018.