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As promising candidates for next-generation quantum and semiconductor technologies, atomic-layer and two-dimensional (2D) materials offer unique opportunities for manipulating light–matter interactions at the atomic level. However, their ultrathin nature confines the available interaction volume, posing inherent limitations to efficient optical coupling and integration with nanophotonic architectures.
To achieve atomic-level control over light coupling, an ultrathin freestanding photonic nanomembrane is developed, serving as a versatile platform for integrating atomic-layer and 2D materials. Freestanding nanomembranes, characterized by their extreme thinness and absence of substrates, exhibit excellent optical transparency, high-Q resonance capability, and broad material compatibility. This suspended configuration maximizes light–matter interactions through localized surface fields and ensures dimensional compatibility with atomic-layer materials. Through atomic-layer deposition (ALD) of dielectric material, we demonstrate atomic-scale thickness modulation, where a single ALD cycle induces a Å-level redshift of the high-Q resonance.
Building on this atomically controllable nanomembrane platform, we integrate transition metal dichalcogenide (TMD) monolayers such as WS2, WSe2, and MoS2, which possess strong excitonic resonances, direct bandgaps, and pronounced nonlinear optical responses. The freestanding photonic nanomembrane supports quasi-bound states in the continuum (quasi-BICs) that suppress radiative losses while confining light tightly within the monolayer region, leading to enhanced light–matter interactions. This strong coupling gives rise to quasi-BIC–mediated exciton–polariton formation, accompanied by pronounced enhancement in photoluminescence (PL) and second-harmonic generation (SHG) with excellent spatial uniformity across a large area.

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Keyword: Membrane, TMDC, Bound states in the continuum, Ultrathin, Perovskite nanocrystal

Conference: 2026 MRS Spring Meeting & Exhibit (2026-04-26 - 2026-05-01)

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Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6280

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Updated at: 2026-05-12 09:25:49 +0900

Published on MDR: 2026-05-12 12:26:57 +0900