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Related Experiment Video

Updated: Jun 20, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Ultrasensitive Photothermal Switching with Resonant Silicon Metasurfaces at Visible Bands.

Ying Che¹, Tianyue Zhang², Tan Shi¹

¹Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.

|November 16, 2023

Summary

Researchers demonstrate active control of quasi-bound states in the continuum (q-BICs) for visible light nanophotonic devices. This photothermal method enables nanoscale optical switching with high modulation depth.

Keywords:

bound states in the continuum photothermal silicon metasurfaces ultrasensitive switching

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Area of Science:

Nanophotonics
Optical switching
Silicon photonics

Background:

Quasi-bound states in the continuum (q-BICs) are crucial for silicon-based nanophotonic applications.
Current tuning methods for q-BICs are limited to infrared and THz ranges, with low efficiency in the visible spectrum.

Purpose of the Study:

To achieve active manipulation of q-BICs for nanoscale optical switching in the visible light range.
To introduce a novel photothermal mechanism for controlling q-BIC resonances.

Main Methods:

Utilizing a photothermal mechanism to induce local index perturbation in silicon.
Employing optical heating to modify the complex refractive index.
Investigating the ultrasensitive response of sharp q-BIC resonances to index perturbation.

Main Results:

Demonstrated active manipulation of q-BICs using optical heating of silicon.
Achieved significant suppression of sharp q-BIC resonances with a mild pump intensity (1 MW/cm²).
Obtained an active modulation depth of reflectance exceeding 80%.

Conclusions:

The photothermal approach enables effective nanoscale optical switching in the visible spectrum.
This method provides an ultrasensitive platform for dynamic nanophotonic devices.
The findings pave the way for advanced silicon-based active nanophotonic applications.