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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.

権利情報:

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キーワード: Membrane, TMDC, Bound states in the continuum, Ultrathin, Perovskite nanocrystal

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

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原稿種別: 査読前原稿 (Author's original)

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

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更新時刻: 2026-05-12 09:25:49 +0900

MDRでの公開時刻: 2026-05-12 12:26:57 +0900