Abstract
We have studied the reflectance spectra of T-shape nanohole array in a layer of Photonic crystal (PhC) slab. Results show that light can be confined perfectly in the PhC slab at a given incident angle at a suitable hole shape, hole size, layer thickness, and refractive index of surrounding medium. We obtained that the Q-factor at BIC can exceed 105, and the wavelength, incident angle of BIC can be modulated by structure parameters and surrounding mediums dielectric factor. Especially, the BIC has high sensitivity to the refractive index of the surrounding medium. The results can be helpful in the design of new-type photonics devices, such as filters and sensors.
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