Abstract
We design an ultra-compact water temperature sensor by using the photonic crystal technology on the InP substrate at the 1.55-μm wavelength window. The photonic crystal consists of rods in a hexagonal lattice and a polymethyl methacrylate (PMMA) background. By using the plane wave expansion (PWE) method, the lattice constant and radius of rods are obtained, 520 nm and 80.6 nm, respectively. With a nanocavity placed in the waveguide, a resonance peak is observed at the 1.55-μm wavelength window. Any change of the water temperature inside the nanocavity results in the shift of the resonance wavelength. Our simulations show a shift of about 11 nm for a temperature change of 22.5 ℃. The resonance wavelength has a linear relation with the water temperature.
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Nikoufard, M., Kazemi Alamouti, M. & Adel, A. Ultra-compact photonic crystal based water temperature sensor. Photonic Sens 6, 274–278 (2016). https://doi.org/10.1007/s13320-016-0321-0
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DOI: https://doi.org/10.1007/s13320-016-0321-0