A self-biased optoelectronic methane sensor based on Fano resonance in a cryptophane-A-infiltrated GaAs photonic crystal integrated with an InGaAs/InP photodiode
We report the design and multiphysics simulation of a monolithically integrated optoelectronic methane (CH$$_4$$) sensor that operates without external electrical bias or spectroscopic instrumentation. The device comprises a methane-selective cryptophane-A-infiltrated GaAs photonic crystal slab, engineered to support a sharp Fano resonance at $$\lambda \approx 1560$$ nm, monolithically integrated with an InP/In$$_{0.53}$$Ga$$_{0.47}$$As/InP p-i-n photodiode. Methane adsorptio
Researchers have developed a novel optoelectronic sensor capable of detecting methane without needing external electrical power or complex spectroscopic equipment. The device integrates a methane-sensitive material within a photonic crystal structure that exhibits a sharp Fano resonance. When methane molecules are absorbed, they alter the refractive index, causing a shift in this resonance. This optical shift is then directly converted into an electrical signal by an underlying photodiode, producing a measurable change in photocurrent.
This self-powered, high-speed methane sensor offers a compact and scalable solution for real-time environmental monitoring and industrial safety applications.
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