Coupled resonant optical waveguide (CROW) gyroscope is an important type of integrated optical gyroscope based on Sagnac effect. However, the traditional CROW design method relying on empirical adjustment of parameters is deficient in achieving its best capability and the poor Sagnac effect of micro-scale devices leads to unsatisfactory performance of integrated devices. Therefore, the present study proposes a new approach to design CROW gyroscope by applying intelligent optimization algorithm (PSO: particle swarm algorithm) to design CROW gyroscope. Three aspects of work will be explored: Firstly, a new evaluation index is proposed to evaluate the efficiency of integrated optical gyroscope area utilization (EGA). Secondly, The performance limits for different losses and the accuracy limits and related parameters that can be achieved by increasing the resonator area at different losses are also explored. Finally, we designed theoretical performance (The angle random walk) up to 29.1𝑑𝑒𝑔/√ℎ and only 1mm × 1mm in size.
We designed and studied a narrowband absorber with two absorption peaks for mid-infrared spectroscopy and multispectral detection applications. The absorber is composed of a silicon grating loaded on a continuous gold film. The grating has two silicon strips in each unit cell, with the same height but different widths. Numerical results indicate that the absorption peaks under normal incidence locate at wavelengths of ∼3.863 and ∼4.004 μm, with bandwidths of ∼28 and ∼33 nm, respectively. Both peaks exhibit high absorptivities of >0.996. We found that the excited surface-plasmon-polariton modes traveling in different directions in the structure are spectrally separated and result in the two absorption peaks.
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