📚 Publications

You can also find my articles on my Google Scholar profile.

Ideal optical antimatter using passive lossy materials under complex frequency excitation

O. Y. Long, P. B. Catrysse, S. Han, and S. Fan

Published in Light: Science & Applications, 2026

Losses have been a significant barrier to realizing optical antimatter with negative-index metamaterials. In this work, we show that passive, lossy materials can be used to realize optical antimatter when illuminated by light at a complex frequency, and that positive-index materials can act as negative-index materials under complex frequency excitation.

Nonreciprocal scintillation using one-dimensional magneto-optical photonic crystals

O. Y. Long, S. Pajovic, C. Roques-Carmes, Y. Tsurimaki, N. Rivera, M. Soljačić, S. V. Boriskina, and S. Fan

Published in Physical Review Applied, 2024

Scintillation represents a promising platform for exploring emission that is both nonequilibrium and nonreciprocal. In this work, we propose a nonreciprocal scintillator using a one-dimensional magnetophotonic crystal in the Voigt configuration.

Topological nature of non-Hermitian degenerate bands in structural parameter space

O. Y. Long, C. Guo, and S. Fan

Published in Physical Review Applied, 2023

We achieve complex band degeneracy in a photonic crystal structure over a region of momentum space, which gives rise to polarization-independent transmission. The degeneracy manifests as a topological singularity in the structural parameter space.

Time reflection and refraction in synthetic frequency dimension

O. Y. Long, K. Wang, A. Dutt, and S. Fan

Published in Physical Review Research, 2023

We demonstrate that time reflection and refraction can be observed in a two-band model centered around a non-zero reference energy. Our model can be physically implemented as a system of two coupled dynamically-modulated ring resonators.

Polarization-independent isotropic nonlocal metasurfaces with wavelength-controlled functionality

O. Y. Long, C. Guo, W. Jin, and S. Fan

Published in Physical Review Applied, 2022

We design a polarization-independent metasurface using guided resonances with degenerate band curvatures in a photonic crystal slab. Our device can perform both free-space compression and spatial differentiation when operated at different frequencies at normal incidence.