SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Poster Session II: New methods II
O 22.4: Poster
Montag, 1. März 2021, 13:30–15:30, P
Bound in the continuum modes in indirectly-patterned hyperbolic media — •Hanan Herzig Sheinfux1, Lorenzo Orsini1, Minwoo Jung2, Iacopo Torre1, Matteo Ceccanti1, Eli Janzen3, James Edgar3, Gennady Shvets2, and Frank H Koppens1 — 1ICFO, Spain — 2Cornell university, USA — 3Kansas state university, USA
Conventional optical cavities support one or more modes, which are unable to leak out of the cavity. Bound state in continuum (BIC) cavities are an unconventional alternative, where there are available channels for the mode to leak through, but it remains confined due to destructive interferences. BICs are a general wave phenomenon. It is interesting to consider BICs in the context of hyperbolic media (HyM), as a way to produce cavties with extremely small mode volume and enhanced light matter interaction. However a hyperbolic BIC cavity presents a fundamental challenge, since the cavity's HyM cladding supports an infinite number of modes which would need to interfere. Here, we introduce hyperbolic BICs (hBICs) and construct the first BIC-based nanocavities. These hBICs are formed through a novel multimodal reflection spatial mechanism, to do with the vanishing spatial overlap between ray-like excitations in a HyM and all leakage channels. Using near-field microscopy, we directly observe this asymmetrically enhanced reflection and demonstrate mid-IR nanocavities with volumes down as small as 15x15x3nm and quality factors reaching above 100, a dramatic improvement in several metrics of confinement.