Journal Publications

Since joining the University of Dayton

1) J. Shen, D. Donnelly, S. Chakravarty, Slow Wave Enhanced On-Chip Michelson Interferometer Sensor, Opt. Lett. 48 (22), 5887 (2023)

2) J. Shen, D. Donnelly, S. Chakravarty, Design of a phase-change-material integrated, phase-error corrected, resolution-enhanced Michelson interferometer Fourier transform spectrometer, (in preparation)

3) J. Shen, S. Chakravarty, Design of a compact, resonance trimmed atto-joule-per-bit bus-coupled photonic crystal nanobeam switch, (in preparation)

Prior to joining the University of Dayton
**Starred Publications were funded as Principal Investigator (PI)

4) S. Chakravarty, R. Safian, M. Teng, L. Zhuang, Hybrid Materials Integration in Silicon Photonic Integrated Circuits, Journal of Semiconductors 42 (4), 1 (2021)

5) R. Safian, M. Teng, L. Zhuang, S. Chakravarty, Foundry compatible thin film lithium niobate modulator with RF electrodes buried inside silicon oxide layer of the SOI wafer, Opt. Express 28 (18), 25843 (2020)

6) C-W. Chang, X. Xu, S. Chakravarty, H-C. Huang, L-W. Tu, Q. Y. Chen, H. Dalir, M. A. Krainak, R. T. Chen, Pedestal subwavelength grating metamaterial waveguide ring resonator for ultra-sensitive label-free biosensing, Biosens. Bioelectron. 141, 111396 (2019)

7) **A. Rostamian, S. Chakravarty, J. Guo, C-J. Chung, D. Nguyen, R. T. Chen, Mid-Infrared silicon on sapphire polarization rotator-splitters, IEEE Photon. Tech. Lett. 31 (5), 401 (2019)

8) **C-J. Chung, J. Midkiff, A. Rostamian, J. Guo, R. T. Chen, S. Chakravarty, InP-based Polarization Rotator-Splitter for Mid-infrared Photonic Integration Circuits, AIP Advances 9 (1), 015303, (2019)

9) **Yi Zou, S. Chakravarty, C-J. Chung, X. Xu, R. T. Chen, Mid-infrared silicon photonic waveguides and devices [Invited], Photon. Res. 6, 254-276 (2018)

10) H. Yan, C. J. Yang; N. Tang, Y. Zou, S. Chakravarty, A. Roth, R. T. Chen, Specific Detection of Antibiotics by Silicon On-chip Photonic Crystal Biosensor Arrays, IEEE Sensors J. 99, 1 (2017).

11) L. J. Huang, H. Yan, X. Xu, S. Chakravarty, N. M. Tang, H. P. Tian, R. T. Chen, Improving the detection limit for on-chip photonic sensors based on subwavelength grating racetrack resonators, Opt. Exp. 25 (9), 10527 (2017)

12) **C. Liu, Z. Wang, E. W. Li, Z. X. Liang, S. Chakravarty, X. Xu, A. X. Wang, R. T. Chen, D. L. Fan, Electrokinetic Manipulation Integrated Plasmonic Photonic Hybrid Raman Nanosensors with Dually Enhanced Sensitivity, ACS Sensors 2(3), 346 (2017).

13) H. Yan, L. J. Huang, X. Xu, S. Chakravarty, H. P. Tian, R. T. Chen, Unique surface sensing property and enhanced sensitivity in microring resonator biosensors based on subwavelength grating waveguides, Opt. Exp. 24 (26), 29725 (2016).

14) H. Yan, X. Xu, C-J. Chung, H. Subbaraman, Z. Y. Pan, S. Chakravarty, R. T. Chen, One-dimensional photonic crystal slot waveguide for silicon-organic hybrid electro-optic modulators, Opt. Lett. 41 (23), 5466 (2016).

15) **S. Chakravarty, X. Chen, N.Tang, W-C. Lai, Y. Zou, H. Yan, R. T. Chen, Review of design principles of 2D photonic crystal microcavity biosensors in silicon and their applications, Frontiers of Optoelectronics 9(2), 206 (2016).

16) **X. Zhang, S. Chakravarty, C.-J. Chung, Z. Pan, H. Yan and R. T. Chen, Ultra-compact and wide-spectrum-range thermo-optic switch based on silicon coupled photonic crystal microcavities, Applied Physics Letters, vol. 107, 21104 (2015).

17) **Y. Zou, S. Chakravarty, P. Wray, R. T. Chen, Mid-Infrared Holey and Slotted Photonic Crystal Waveguides in Silicon-on-Sapphire for Chemical Warfare Simulant Detection, Sensors and Actuators B 221, 1094–1103 (2015).

18) **Y. Zou, S. Chakravarty, R. T. Chen, Mid-Infrared Silicon-on-Sapphire Waveguide Coupled Photonic Crystal Microcavities, Applied Physics Letters, 107, 081109 (2015).

19) **H. Yan, Y. Zou, S. Chakravarty, C-J. Yang, Z. Wang, N. Tang, D. Fan, R. T. Chen, Silicon on-chip bandpass filters for the multiplexing of high sensitivity photonic crystal microcavity biosensors, Appl. Phys. Lett. 106, 121103 (2015).

20) **Z. Wang, H. Yan, S. Chakravarty, H. Subbaraman, X. Xu, D. Fan, A. X. Wang, R.T. Chen, Microfluidic Channels with Ultralow Loss Waveguide Crossings for Various Chip-integrated Photonic Sensors, Optics Lett. 40(7), 1563 (2015)

21) **Y. Zou, S. Chakravarty, P. Wray, R. T. Chen, Experimental Demonstration of Propagation Characteristics of Mid-Infrared Photonic Crystal Waveguides in Silicon-on-Sapphire, Optics Express 23, 6965 (2015).

22) **X. Xu, H. Subbaraman, S. Chakravarty, A. Hosseini, J. Covey, D. Kwong, W-C. Lai, Y. Zou, Y-H. Chen, N. Lu, R.T. Chen, Flexible Single Crystal Silicon Nanomembrane Photonic Crystal Cavity, ACS Nano 8(12), 12265 (2014).

23) **S. Chakravarty, A. Hosseini, X. Xu, L. Zhu, Y. Zou, R. T. Chen, Analysis of ultra-high sensitivity configuration in chip-integrated photonic crystal microcavity bio-sensors," Appl. Phys. Lett. 104, 191109 (2014).

24) **Y. Zou, H. Subbaraman, S. Chakravarty, X. Xu, A. Hosseini, W. Lai, P. Wray, R. T. Chen, Grating-coupled silicon-on-sapphire integrated slot waveguides operating at mid-infrared wavelengths, Optics Lett. 39, 3070-3073 (2014).

25) **Y. Zou, S. Chakravarty, L. Zhu, R. T. Chen, The role of group index engineering in series-connected photonic crystal microcavities for high density sensor microarrays, Appl. Phys. Lett.104, 141103 (2014).

26) D. Kwong, J. Covey, A. Hosseini, X. Xu, Y. Zhang, S. Chakravarty, R. T. Chen, Corrugated Waveguide Based Optical Phased Array with Crosstalk Suppression, IEEE Photon. Tech. Lett. 26 (10), 991 (2014).

27) **Y. Zou, S. Chakravarty, D. N. Kwong, W-C. Lai, X. Xu, X. Lin, A. Hosseini, R. T. Chen, Cavity-Waveguide Coupling Engineered High Sensitivity Silicon Photonic Crystal Microcavity Biosensors with High Yield, IEEE J. Sel. Top. Quant. Electron. 20(4), 6900710 (2014).

28) X. Zhang, A. Hosseini, S. Chakravarty, J. Luo, A. K-Y Jen, R. T Chen, Wide optical spectrum range, subvolt, compact modulator based on an electro-optic polymer refilled silicon slot photonic crystal waveguide, Optics Lett. 38 (22), 4931-4934 (2013)

29) **W-C. Lai, S Chakravarty, Y Zou, RT Chen, Multiplexed detection of xylene and trichloroethylene in water by photonic crystal absorption spectroscopy, Optics Lett. 38 (19), 3799-3802 (2013)

30) **W-C. Lai, S. Chakravarty, Y. Zou, R.T. Chen, Slow Light Enhanced Sensitivity of Resonance Modes in Photonic Crystal Biosensors, Appl. Phys. Lett. 102 (4), 041111 (2013)

31) **S. Chakravarty, W-C. Lai, Y. Zou, H.A. Drabkin, G.R. Simon, S.H. Chin, R. M. Gemmill, R.T. Chen, Multiplexed Specific Label-Free Detection of NCI-H358 Lung Cancer Cell Line Lysates with Silicon Based Photonic Crystal Microcavity Biosensors, Biosens. Bioelectron. 43, 50 (2013).

32) **S. Chakravarty, Y. Zou, W-C. Lai, R.T. Chen, Slow light engineering for high Q high sensitivity photonic crystal microcavity biosensors in silicon, Biosens. .Bioelectron. 38(1), 170 (2012).

33) **Y. Zou, S. Chakravarty, W-C. Lai, R.T. Chen, Methods to Array Photonic Crystal Microcavities for High Throughput High Sensitivity Bio-Sensing on a Silicon-Chip Based Platform, Lab Chip 12, 2309 (2012).

34) **W-C. Lai, S. Chakravarty, Y. Zou, R.T. Chen, Silicon nano-membrane based photonic crystal microcavities for high sensitivity bio-sensing, Optics Lett. 37 (7), 1208 (2012)

35) **X.B. Xu, D.H. Hasan, L. Wang, S. Chakravarty, R.T. Chen, D.L. Fan, A.X. Wang, Guided-mode-resonance-coupled plasmonic-active SiO2 nanotubes for surface enhanced Raman spectroscopy, Appl. Phys. Lett. 100(19), 191114 (2012).

36) C-Y. Lin, X. Wang, W-C. Lai, J.L. Covey, S. Chakravarty, R.T. Chen, Coupling loss minimization of slow light slotted photonic crystal waveguides using mode matching with continuous group index perturbation, Optics Lett. 37, 232 (2012).

37) **W-C. Lai, S. Chakravarty, X. Wang, C. Lin, R.T. Chen, On-Chip methane sensing by near-IR absorption signatures in a photonic crystal slot waveguide, Optics Lett. 36, 984 (2011).

38) **W-C. Lai, S. Chakravarty, X. Wang, C. Lin, R.T. Chen, Photonic Crystal Slot Waveguide Absorption Spectrometer for On-Chip Near-Infrared Spectroscopy of Xylene in Water, Appl. Phys. Lett. 98 (2), 023304 (2011).

39) X. Wang, C-Y. Lin, S. Chakravarty, J. Luo, A-K-Y. Jen, R.T. Chen, Effective In‐Device r33 of 735pm/V on Electro‐Optic Polymer Infiltrated Silicon Photonic Crystal Slot Waveguide, Optics Lett. 36 (6), 882 (2010).

40) C-Y. Lin, X. Wang, S. Chakravarty, B-S. Lee, W-C. Lai, R.T. Chen, Wideband Group Velocity Independent Coupling into Slow Light Silicon Photonic Crystal Waveguide, Appl. Phys. Lett. 97 (18), 183302 (2010).

41) C-Y. Lin, X. Wang, S. Chakravarty, B-S. Lee, W-C. Lai, J. Luo, A-K-Y. Jen, R.T. Chen, Electro-optic polymer infiltrated silicon photonic crystal slot waveguide modulator with 23 dB slow light enhancement, Appl. Phys. Lett. 97 (9), 093304 (2010).

42) X. Wang, S. Chakravarty, B-S. Lee, C. Lin, R.T. Chen, Ultraefficient control of light transmission through photonic potential barrier modulation, Opt. Lett. 34(20), 3202 (2009).

43) X. Chen, A. Wang, S. Chakravarty, R.T. Chen, Electrooptically-active slow light enhanced silicon slot photonic crystal waveguides, IEEE Journal of Selected Topics in Quantum Electronics 15 (5), 1506 (2009).

44) S. Chakravarty, P. Bhattacharya, S. Chakrabarti, Z. Mi, Multiwavelength ultra-low threshold lasing in quantum dot photonic crystal microcavities, Opt. Lett. 32, 1296 (2007), also selected in the Virtual J. Nanoscale Science and Tech. (Vol. 15, Issue 17, 2007).

45) S. Chakravarty, P.Bhattacharya, Z. Mi, Electrically injected quantum-dot photonic crystal microcavity light emitting arrays with air-bridge contacts, IEEE Photon. Tech. Lett., 18, 2665 (2006).

46) S. Chakravarty, P. Bhattacharya, J. Topoľančik, Electrically-injected quantum-dot photonic-crystal microcavity light-emitters and microcavity arrays, J. Phys. D 40, 2683 (2007).

47) P. Boolchand, M. Jin, D. Novita, S. Chakravarty, Raman scattering as a probe of intermediate phases in glassy networks, Journal of Raman Spectroscopy 38 (6), 660 (2007).

48) J. Topoľančik, S. Chakravarty, P. Bhattacharya, S. Chakrabarti, Electrically injected quantum-dot photonic crystal microcavity light sources, Opt. Lett.31, 232 (2006), also selected in the Virtual J. Nanoscale Science and Tech. (Vol. 13, Issue 6, 2006)

49) P. Bhattacharya, J. Sabarinathan, J. Topoľančik, S. Chakravarty, P.C. Yu, W. Zhou, Quantum dot photonic crystal light sources, Proc. of the IEEE 93 (10), 1825-1838 (2005).

50) S. Chakravarty, J. Topoľančik, P. Bhattacharya, S. Chakrabarti, Y. Kang, M.E. Meyerhoff, Ion detection with photonic crystal microcavities, Opt. Lett. 30, 2578 (2005).

51) P. C. Yu, J. Topoľančik, S. Chakravarty, P. Bhattacharya, Mode-coupling characteristics and efficiency of quantum-dot electrically injected photonic crystal waveguide-coupled light-emitting diodes, IEEE Journal of Quantum Electronics 41(3), 455 (2005).

52) S. Chakravarty, D.G. Georgiev, P. Boolchand, M. Micoulaut, Aging, fragility and the reversibility window in bulk alloy glasses, J. Phys.-Cond. Matt. 17(1), L1-L7 (2005).

53) P. Boolchand, D.G. Georgiev, T. Qu, F. Wang, L. Cai, and S. Chakravarty, Nano-scale phase separation effects near r = 2.4 and 2.67, and rigidity transitions in chalcogenide glasses, Comptes Rendus Chimie 5 (11), 713-724 (2002).