Shadman Shahid

Graduate Student (PhD) - Electrophysics

Department of Electrical and Computer Engineering

University of Southern California

I am currently a PhD Student at University of Southern California in the Department of Electrical and Computer Engineering. My research focus lies in nanophotonics and metasurface design.

I have done my M.Sc in Electrical and Electronic Engineering from Bangladesh University of Engineering and Technology (BUET) with a specialization in Electronics and photonics under Professor Dr. Anisuzzaman Talukder. Previously, I have been as a Machine Learning Engineer in ACI Limited.

My research interest includes nanophotonics and plasmonics, photonic design optimization and photonic inverse design. However, a thanks to my recent role as a machine learning engineer since July 2022, I also have workable expertise in Machine learning/Deep learning techniques and tools, especially in the context of serving a multi-faceted business institution.

I have previously worked with a special class of plasmonic lasers called Tamm-plasmon lasers. My goal had been to devise a design for a tamm-plasmon laser, that could operate with two closely spaced modes. To that end, I, along with my former research partner Shahed-e-Zumrat devised two different approaches. The first approach utilized a lateral redesigning of a simple rectangular nanohole array to a more complex merged lattice array. The second approach relied on the utilization of two distributed Bragg reflectors, tuned to slightly different wavelengths

News

Jan 10, 2025	My classes and research duties as an RA started from 10 January 2025.
Jan 27, 2023	I have taken a Workshop on Lumerical FDTD in Bangladesh University of Engineering and Technology, my alma mater.

Selected Publications

A merged lattice metal nanohole array based dual-mode plasmonic laser with an ultra-low threshold

Shadman Shahid, Shahed-E- Zumrat, and Muhammad Anisuzzaman Talukder

Nanoscale Adv., 2022

Abs

Plasmonic lasers offer great potential for cutting-edge, disruptive applications. However, they suffer from a high loss in metals, lack of spatial coherence in the near field, and divergent far-field emission. The challenges are even more significant for a plasmonic laser emitting more than one wavelength mode. The design complexity required for creating multiple modes often limits avenues for minimizing losses and converging far-field emission patterns. This work exploits plasmonic resonances at the junction of a merged lattice metal nanohole array (NHA) and a one-dimensional photonic crystal to achieve dual-mode lasing. The merged lattice NHA is designed by concentrically combining two simple NHAs with different periodicities to create pseudo randomness, leading to enhanced localization and confinement of light in multiple wavelength modes. The proposed structure notably produces intense dual-mode lasing at an ultra-low threshold compared to recent state-of-the-art plasmonic laser demonstrations. The wavelengths of the lasing modes and the separation between them can be tuned over a broad range by changing the structural parameters. The proposed laser also creates a highly directional far-field pattern with a divergence angle of only <0.35°.
Dual-wavelength hybrid Tamm plasmonic laser

Shahed-E-Zumrat, Shadman Shahid, and Muhammad Anisuzzaman Talukder

Opt. Express, Jul 2022

Abs

Miniature lasers emitting dual-wavelength modes have diverse applications alongside the more explored single-mode counterparts. However, having dual-wavelength modes originating from a plasmonic-photonic hybrid laser is still a relatively new area for research. Compared to the amount of literature devoted to the physics of such hybrid cavities, only a few have analyzed their role in lasing applications. Notably, the role of hybrid cavities in dual-wavelength lasing is still unexplored. In this work, the properties of one-dimensional distributed Bragg reflectors and thin metal nanohole arrays come together to create a hybrid dual-mode plasmonic laser. The similar energy distribution characteristics of photonic and plasmonic lasers make hybrid structures a viable choice for efficient dual-mode lasing. In this work, the lasing cavity simultaneously excites photonic and Tamm plasmonic modes to generate dual-mode lasing. Consequently, the proposed laser shows high emission output with narrow linewidth and a clear and tunable mode separation.