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physics.optics2026
Quasi-bandgap behavior in non-Hermitian photonic crystals
Jin Xu, Daniel Cui, Aaswath P. Raman
We investigate non-Hermitian photonic crystals in which the lossy and lossless constituents share the same real permittivity and differ only in their imaginary part. We characteriz…
physics.optics2024
Thermo-optic tuning of directional infrared emissivity
Jae S. Hwang, Jin Xu, Aaswath P. Raman
Tuning the spatial extent of directional thermal emission across an arbitrary, and fixed spectral bandwidth is a fundamentally enabling capability for a range of emerging applicati…
physics.optics2022
Simultaneous control of spectral and directional emissivity with gradient epsilon-near-zero InAs photonic structures
Jae Seung Hwang, Jin Xu, Aaswath P. Raman
Controlling both the spectral bandwidth and directional range of emitted thermal radiation is a fundamental challenge in modern photonics and materials research. Recent work has sh…