In this paper, we provide a new type of subwavelength grating waveguides (SWGs) with a guiding mechanism from 1.5μm to 6μm on a silicon-on-insulator (SOI) platform. Two different SWGs with the same period but different height, corresponds to different effective subwavelength refractive indices, are designed and served as the core and cladding respectively. The biggest hindrance for transmission bandwidth, the buried oxide, is then removed to build up a suspended SWGs, contributing to bandwidth enlargement. In the meantime, the results also show light-matter interaction enhancement that ~34% propagating energy locates in the air can fully interact with testing analytes, leading to higher sensitivity. The broadband and high light-matter integral signatures would address the demands for ideal absorption spectroscopy based lab-on-chip.
We investigate a fourth-order PT symmetric optical sensor and analyze its eigenfrequency phase diagram. The four eigenfrequencies of our optical sensor simultaneously collapse at the high-order exceptional point in parameter space, providing a quarter root relation between the frequency splitting amount and the perturbation. A clear sensitivity boost is observed when comparing the frequency splitting with other optical sensors under small perturbation condition.
We proposed and demonstrated a deep learning assisted on-chip Fourier transform spectroscopy (FTS), using an artificial neural networks (ANN) to analyze the output stationary interferogram. It is found that, compared with the conventional FTS, the resolution could be improved without increasing the maximum path length difference and the number of MZIs, thus reducing the burden of adding more power budget. This new concept of enhancing spectral resolution may hold great promise for potential applications in integrated FTS.
In this paper, we propose a new type of subwavelength grating (SWG) racetrack resonator with engineered coupling condition and waveguide nanostructure. Highly dispersive coupling condition between bus waveguide and SWG ring is achieved, which has a V-shape envelope of resonance spectrum, through adjusting the SWG unit shape, dimension and the length of directional coupling region. When top cladding refractive index changes, instead of indicated in single resonant wavelength shift, which is the case for conventional SWG ring resonator, the movement of the spectrum envelope peak actually represents the sensitivity of our device. SWG racetrack resonators with two different widths are investigated, showing much bigger spectrum shift compared with the conventional one. The results may provide a new approach for further improve device sensitivity and hold great promise for potential applications in integrated optical sensor.
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