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Download fileLasing at Multidimensional Topological States in a Two-Dimensional Photonic Crystal Structure
journal contribution
posted on 16.07.2020, 16:37 authored by Changhyun Han, Minsu Kang, Heonsu JeonRecently,
topologically engineered photonic structures have garnered
significant attention, as their eigenstates may offer a new insight
on photon manipulation and an unconventional route for nanophotonic
devices with unprecedented functionalities and robustness. Herein,
we present lasing actions at all hierarchical eigenstates that can
exist in a topologically designed single two-dimensional (2D) photonic
crystal (PhC) platform: 2D bulk, one-dimensional edge, and zero-dimensional
corner states. In particular, multiple topological eigenstates are
generated in a hierarchical manner with no bulk multipole moment.
The unit cell of the topological PhC structure is a tetramer composed
of four identical air holes perforated into an InGaAsP multiple-quantum-well
epilayer slab. A square area of a topologically nontrivial PhC structure
is surrounded by a topologically trivial counterpart, resulting in
multidimensional eigenstates of one bulk, four side edges, and four
corners within and at the boundaries. Spatially resolved optical excitation
spontaneously results in lasing actions at all nine hierarchical topological
states. Our experimental findings may provide insight into the development
of sophisticated next-generation nanophotonic devices and robust integration
platforms.
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2 D bulkinsightMultidimensional Topological Stateslasing actionstopologically nontrivial PhC structureInGaAsP multiple-quantum-well epila...platformeigenstateTwo-Dimensional Photonic Crystal St...next-generation nanophotonic devicesbulk multipole momenttopological PhC structurezero-dimensional corner states