About

Nusrat Jahan joined Professor Choquette’s group in 2020. She is a PhD student at the department of Electrical and Computer Engineering (ECE) at University of Illinois, Urbana-Champaign. She had her MSc. in Electrical and Electronic Engineering (EEE) from Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh in August, 2019. She finished her BSc. in EEE from the same university in 2017. She worked as a Design Engineer and part-time Lecturer in Bangladesh. Currently she is working on the design and characterization of coupled VCSEL array.

Research

Coherently-Coupled Photonic Crystal VCSEL Arrays (2020-2023)

For mode engineering, electronic beam steering, and enhanced modulation, the coherently coupled photonic crystal VCSEL arrays have been analyzed.

Complex Coupling Coefficient:

Using coupled rate equation and coupled mode equation, the complex coupling coefficient of a 2x1 photonic crystal VCSEL array has been analyzed by PDRG group members. The imaginary coupling coefficient can be extracted from the output optical power and the excess power due to coherent coupling. Nusrat works on analyzing this extracted coupling coefficient and the coupling induced excess power.

Antiguided Array Modeling:

Based on the one-dimensional refractive index model developed by PDRG group members, Nusrat performs analysis on the coupled supermode and its confinement factor. The photonic crystal parameter: hole diameter, pitch etc can be tuned to engineer different threshold supermode of the coupled VCSEL arrays.

Publications

Journal Articles

N. Jahan, W. North, N. Kolagotla, and K. Choquette, “Fourier Beam Analysis of Photonic Crystal Coupled Triangular VCSEL Array,” Proc. SPIE 12439, 1243905 (2023).
W. North, N. Jahan, P. Strzebonski, and K. D. Choquette, “Modal Characteristics of Coupled Vertical Cavity Surface Emitting Laser Diode Arrays,” J. Appl. Phys. 132, 173102 (2022).
N. Jahan, K. A. Lakomy, P. Strzebonski, B. J. Thompson, and K. D. Choquette, “Low Divergence Coherently Coupled Vertical Cavity Surface Emitting Ring Laser Arrays,” IEEE J. Photon. 14, 19430655 (2022).
N. Jahan, W. North, and K. Choquette, “Supermode Dynamics in Coherent VCSEL Arrays,” Proc. SPIE 12020, 120200A (2022).
P. Strzebonski, W. North, N. Jahan, and K. D. Choquette, “Analysis of Coherence and Coupling in Vertical Cavity Surfae Emitting Laser Arrays,” (invited) J. Quan. Electron. 58, 2400508 (2022).
N. Jahan, W. North, P. Strzebonski, and K. D. Choquette, “Supermode Switching in Coherently-Coupled Vertical Cavity Surface Emitting Laser Diode Arrays,” IEEE J. Sel. Topics Quan. Electron., 28, no. 1, 1700505 (2022).
P. Strzebonski, H. Dave, K. Lakomy, N. Jahan, W. North, and K. D. Choquette, “Computational Methods for VCSEL Array Characterization and Control,” Proc. SPIE (2021).

Conference Proceedings

N. Jahan, W. North, K. D. Choquette, “Fourier Beam Analysis of Photonic Crystal Coupled Triangular VCSEL Array,,” SPIE Photonics West, San Francisco, CA (Feb. 2023).
N. Jahan, W. North, P. Strzebonski, K. D. Choquette, “Analysis of Supermode Dynamics fof Coherent Dual-Element Photonic Crystal VCSEL Arrays (invited),” IEEE Photonics Conference, Vancouver, Canada (Nov. 2022).
N. Jahan, W. North, and K. D. Choquette, “Low Divergence Triangular Coupled VCSEL Array,” International Semiconductor Laser Conference, Japan virtual (Oct. 2022).
N. Jahan, W. North, K. Choquette, “Supermode Dynamics in Coherent VCSEL Arrays,” SPIE Photonics West, San Francisco, CA (Jan. 2022).
K. D. Choquette, S. E. Ralph, A. Melgar, N. Jahan, W. North, and J. A. Tatum, “Supermode Dynamics for VCSEL Modulation,” IEEE Photonics Conference, virtual (Oct. 2021).
N. Jahan, W. North, and K. D. Choquette, “Quantification of Coherent-Coupling in Photonic Crystal Vertical Cavity Laser Arrays,” International Semiconductor Laser Conference, Potsdam, Germany & virtual (Oct. 2021).
W. North, N. Jahan, P. Strzebonski, and K. D. Choquette, “Spectral Mode Analysis of Non-Hermitian Phased Microcavity Laser Array," Conference on Lasers and Electro-Optics, virtual (May 2021).
P. Strzebonski, W. North, N. Jahan, and K. D. Choquette, “Machine Learning Analysis of 2x1 VCSEL Array Coherence and Imaginary Coupling Coefficient," Conference on Lasers and Electro-Optics, virtual (May 2021).
N. Jahan, W. North, P. K. Strzebonski, K. A. Lakomy, and K. D. Choquette, “Extraction of Coupling Coefficient for Coherent 2x1 VCSEL Array, Conference on Lasers and Electro-Optics, virtual (May 2021).