Abstract
The application of graphene--photonic crystal microcavity structures with phase-change-material layers in spectral analysis is studied. It is found that selective absorption of different wavelengths of light can be realized by changing the crystallinity of the phase-change material, so that different wavelengths of light can be separated and measured in the time domain to perform spectral analysis. Since the phase-transition time of phase-change materials is very fast, this spectral analysis can be done with submicrosecond time resolution. This kind of spectral-analysis device has a simple structure and can be integrated with a chip. It has important prospects for application in the fields of biological molecular recognition, biological sensing, and chemical analysis.
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