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We detect trace gases at ppb levels using evanescent-field absorption spectroscopy in microring resonators coated with sorbent polymers. The overtone spectra derive from mid-infrared resonances that provide a signature of analyte toxicity.
We demonstrate the detection of water vapor adsorbed into a sorbent polymer layer coated onto highly evanescent SiN rib waveguides by measuring the change in absorption as a function of wavelength, polarization, and analyte concentration.
We report the design and theoretical analysis of optical waveguides of the InP-based quantum cascade laser (QCL) operating at λ∼ 9.5 µm. The effective refractive index, optical confinement and absorption coefficient are calculated by using the finite element method (FEM). From FEM simulations, the effect of the number of active/injector stages (Ns) on the optical confinement and waveguide loss of...
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