19 February 2018 The vertical-cavity surface-emitting laser incorporating a high contrast grating mirror as a sensing device
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Abstract
We propose a novel optical sensing system based on one device that both emits and detects light consisting of a verticalcavity surface-emitting laser (VCSEL) incorporating an high contrast grating (HCG) as a top mirror. Since HCGs can be very sensitive to the optical properties of surrounding media, they can be used to detect gases and liquid. The presence of a gas or a liquid around an HCG mirror causes changes of the power reflectance of the mirror, which corresponds to changes of the VCSEL’s cavity quality factor and current-voltage characteristic. By observation of the current-voltage characteristic we can collect information about the medium around the HCG. In this paper we investigate how the properties of the HCG mirror depend on the refractive index of the HCG surroundings. We present results of a computer simulation performed with a three-dimensional fully vectorial model. We consider silicon HCGs on silica and designed for a 1300 nm VCSEL emission wavelength. We demonstrate that our approach can be applied to other wavelengths and material systems.
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Magdalena Marciniak, Magdalena Marciniak, Marcin Gębski, Marcin Gębski, Łukasz Piskorski, Łukasz Piskorski, Maciej Dems, Maciej Dems, M. Wasiak, M. Wasiak, Krassimir Panajotov, Krassimir Panajotov, James A. Lott, James A. Lott, Tomasz Czyszanowski, Tomasz Czyszanowski, } "The vertical-cavity surface-emitting laser incorporating a high contrast grating mirror as a sensing device", Proc. SPIE 10552, Vertical-Cavity Surface-Emitting Lasers XXII, 105520J (19 February 2018); doi: 10.1117/12.2290729; https://doi.org/10.1117/12.2290729
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