Ki Young Lee

Polarization-dependent angularly selective dielectric reflector

Hyosim Yang, Ki Young Lee, Sanghyeok Park, Jiho Noh et autres

Abstract A key limitation of conventional polarizers is their lack of intrinsic angular selectivity. Thus, optical devices that manipulate polarization and propagation direction are forced to realize these two degrees of freedom sequentially, increasing size and complexity. Here, we introduce and experimentally …

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Polarization-dependent angularly selective dielectric reflector

Hyosim Yang, Ki Young Lee, Sanghyeok Park, Jiho Noh et autres

This repository contains the experimental and simulation data associated with the following Nature Communications paper: Polarization-dependent angularly selective dielectric reflector [https://doi.org/10.1038/s41467-026-77529-6].

us (code pays fourni par la source)

Polarization-dependent angularly selective dielectric reflector

Hyosim Yang, Ki Young Lee, Sanghyeok Park, Jiho Noh et autres

This repository contains the experimental and simulation data associated with the following Nature Communications paper: Polarization-dependent angularly selective dielectric reflector [https://doi.org/10.1038/s41467-026-77529-6].

us (code pays fourni par la source)

Dirac bilayer metasurfaces as an inverse Gires-Tournois etalon

Ki Young Lee, Kwang Wook Yoo, Francesco Monticone, Jae Woong Yoon

Efficient transmissive pure-phase resonances are highly desirable for optical modulation and wave front engineering. Here, we propose a principle to realize a pure-phase resonance in an extremely broad transmission band, as opposed to previous approaches restricted to operating in reflection mode or …

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Classification of fragile topology enabled by matrix homotopy

Ki Young Lee, Stephan Wong, Sachin Vaidya, Terry A. Loring et autres

Flat bands in twisted materials have attracted considerable attention due to the emergence of correlated phases that can be associated with the non-Wannier-representable nature of its single-particle states. Specifically, these bands can exhibit a class of topology that can be nullified by …

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Unidirectional guided resonance continuum of Dirac bands in WS2 bilayer metasurfaces

Daegwang Choi, Ki Young Lee, Dong‐Jin Shin, Jae Woong Yoon et autres

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Topological beaming of light: proof-of-concept experiment

Yu Sung Choi, Ki Young Lee, Soo‐Chan An, Minchul Jang et autres

Beam shaping in nanophotonic systems remains a challenge due to the reliance on complex heuristic optimization procedures. In this work, we experimentally demonstrate a novel approach to topological beam shaping using Jackiw-Rebbi states in metasurfaces. By fabricating thin-film dielectric structures with engineered …

kr, us (code pays fourni par la source)

Classification of Fragile Topology Enabled by Matrix Homotopy

Ki Young Lee, Stephan Wong, Sachin Vaidya, Terry A. Loring et autres

The moire flat bands in twisted bilayer graphene have attracted considerable attention not only because of the emergence of correlated phases but also due to their nontrivial topology. Specifically, they exhibit a new class of topology that can be nullified by the …

Polarization angular selective Bragg mirrors

Ki Young Lee, Chloe F. Doiron, Alexander Cerjan

We propose polarization angular selective Bragg mirrors that exhibit highly distinct broadband angular spectral properties for two orthogonal polarizations, in a single compact device. The design utilizes an array of triangular pillars composed of alternating dielectric layers, exhibiting a symmetry bandgap critical …

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Symmetry-protected line of bound states in the continuum for surface-emitting lasers

Ki Young Lee, W. Chow, Alexander Cerjan

We propose a surface-emission cavity incorporating a monolithic 3D photonic-crystal superstrate atop the cavity, supporting symmetry-protected lines of bound states in the continuum for large-area beam steering.

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Angle Robust Polarization selective Bragg mirrors

Hyosim Yang, Ki Young Lee, Chloe F. Doiron, Alexander Cerjan

We propose polarization-selective Bragg mirrors composed of triangular pillars with alternating dielectric layers, designed to yield symmetry bandgaps that enable broadband spectral distinction between orthogonal polarizations, invariant to incidence angle within the plane.

us (code pays fourni par la source)

Topological beaming of light: Proof-of-concept experiment

Yu Sung Choi, Ki Young Lee, Soo‐Chan An, Minchul Jang et autres

Beam shaping in nanophotonic systems remains a challenge due to the reliance on complex heuristic optimization procedures. In this work, we experimentally demonstrate a novel approach to topological beam shaping using Jackiw-Rebbi states in metasurfaces. By fabricating thin-film dielectric structures with engineered …