An electrically controlled tunable photonic crystal filter based on thin-film lithium niobate
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Abstract:
In this paper, we present an electrically controlled tunable photonic crystal filter based on thin-film lithium niobate. The filter incorporates a photonic crystal microcavity structure within the straight waveguide, enabling electronic tuning of the transmitted wavelength through added electrode structures. The optimized microcavity filter design achieves a balance between high transmission rate and quality factor, with a transmission center wavelength of 1551.6nm, peak transmission rate of 96.1%, and quality factor of 5054. Moreover, the filter can shift the central wavelength of the transmission spectrum by applying voltage to the electrodes, with a tuning sensitivity of 13.8pm/V. The proposed tunable filter adopts a simple-to-fabricate air-hole structure and boasts a compact size (length: 11.57μm, width: 5.27μm, area: 60.97μm2), making it highly suitable for large-scale integration. These features make the filter promising for broad applications in the fields of photonic integration and optical communication.
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Project Supported:
the National Natural Science Foundation of China under Grant Nos. 11774181, 62231005, 62275131, 62105164, and 11904262, the Natural Science Foundation of Tianjin under Grant Nos. 19JCYBJC16700, 21JCYBJC00080 and 21JCQNJC00210, the Opening Foundation of Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems under Grant No. 2019LODTS004, Tianjin Education Commission Scien-tific Research Project under Grant Nos. 2019KJ016 and 2018KJ146, Tianjin Development Program for Innovation and Entrepreneurship, and the Fundamental Research Funds for the Central Universities, Nankai University.
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