Active Metasurfaces Achieve 33.5nm BIC Resonance Shift via Sb2S3 Phase Transition, Enabling Tunable Amplified Photoluminescence and Single-Photon Emission

August 17, 2026

MDPI Switzerland

Overview

This research demonstrates a metasurface supporting tunable bound states in the continuum (BIC) resonances in the visible regime, achieving experimental Q-factors up to 206 in an amorphous state. The metasurface shows strong amplification of CIS QDs photoluminescence and quantum light emission from hBN single-photon emitters. It enables BIC resonance shifts of 33.5 nm via phase transition of Sb2S3 and 17 nm through dimensional parametric tuning, resulting in a highly directional photoluminescence amplification up to 33-fold. This work sets a new benchmark for reconfigurable nanophotonic platforms for efficient quantum light sources in integrated photonic systems.

In Depth

Key Findings

This research demonstrates an innovative active metasurface capable of supporting tunable “Bound States in the Continuum (BIC)” resonances in the visible regime. Experimentally, this metasurface achieved a high Q-factor of up to 206 in its amorphous state and successfully amplified both the photoluminescence from CIS Quantum Dots (QDs) and quantum light emission from hexagonal boron nitride (hBN) single-photon emitters.

Technical / Clinical Details

The key to this metasurface’s performance lies in its exceptional tunability. By leveraging the phase transition of antimony trisulfide (Sb2S3), it’s possible to induce a significant BIC resonance shift of 33.5 nm. An additional 17 nm shift can be achieved through dimensional parametric tuning. This dynamic control over excitation wavelength and emission properties allows for optimal output from quantum dots and single-photon emitters. Specifically, the metasurface achieved a highly directional photoluminescence amplification of up to 33-fold, drastically improving the optical output of quantum light sources. The high Q-factor of 206 indicates efficient light confinement within the material, enabling strong light-matter interaction. This technology was realized through the integration of nanoscale structural design with “active” materials that can alter their optical properties in response to external stimuli.

Background & Context

The advancement of next-generation technologies such as quantum information science, quantum computing, and ultra-high-speed optical communication critically depends on highly efficient and controllable quantum light sources. Traditional quantum light sources have faced challenges related to low light extraction efficiency and difficulties in external light modulation. Metasurfaces, artificial materials that manipulate light using sub-wavelength structures, are gaining attention as promising platforms to overcome these challenges. BIC, in particular, is a peculiar physical phenomenon that can strongly confine light within a material, even though it is typically embedded in a continuous spectrum, making it crucial for achieving high-Q factor resonances.

Strategic Significance & Outlook

The development of this active metasurface establishes a new benchmark for designing efficient quantum light sources in integrated photonic systems. Tunable amplified photoluminescence and single-photon emission will contribute to enhancing the performance of various quantum technologies, including quantum communication, quantum sensors, and photonic circuits for quantum computers. Future research will focus on achieving broader tuning ranges, faster modulation speeds, and developing large-scale integration processes. This technology holds the potential to accelerate the commercialization of quantum light technologies and fundamentally transform the future of information technology.

Source: https://www.mdpi.com/2079-4991/16/16/994

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