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首页> 外文会议>International symposium on optoelectronic technology and application >Narrow Bandwidth Liquid Crystal Tunable Filter based on Lyot-Solc Composite Structure
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Narrow Bandwidth Liquid Crystal Tunable Filter based on Lyot-Solc Composite Structure

机译：基于Lyot-Solc复合结构的窄带宽液晶可调滤波器

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We propose here a design of Lyot-Solc composite structure for liquid crystal tunable filter (LCTF) using nematic liquid crystal, which is with high efficiency, narrow bandwidth and electrical tunability. LCTF with high efficiency has many important applications in the fields of optical communication, spectral imaging, and displays. However, most LCTFs adopt cascaded Lyot-type or Sole-type structure, in which multiple pieces of polarizing optical elements exist, causing intensive loss of light intensity. The Lyot-type filter has narrower full width at half maximum (FWHM), but the transmittance is lower. The Sole-type filter has high transmittance and larger free spectral range (FSR) but broader FWHM. We propose a new structure of LCTF composed of Sole-type and Lyot-type structure. The composite 3-level-Solc and 2-level-Lyot LCTF transmission spectrum is a combination of the advantages of the two structures. Through the reasonable structural design, the spectral transmittance is improved, and the secondary transmission peak in the visible spectrum is effectively minimized. At the same time, the output central wavelength can be electrically tunable in the range from 400nm to 650nm by loading different amplitude of driving signals. When the driving signals with amplitude of 1.61V, 1.45V and 1.25V are respectively loaded on the liquid crystal cells of the LCTF, the central wavelengths of the output spectrum are respectively 433nm, 510nm and 595nm, corresponding to the FWHM of 13nm, 16nm and 22nm.
机译：我们在这里提出一种使用向列型液晶的液晶可调滤波器（LCTF）的Lyot-Solc复合结构的设计，该结构具有高效率，窄带宽和电可调性。高效的LCTF在光通信，光谱成像和显示领域具有许多重要的应用。然而，大多数LCTF采用级联的Lyot型或Sole型结构，其中存在多个偏振光学元件，导致光强度的强烈损失。 Lyot型滤光片的半高全宽（FWHM）较窄，但透射率较低。唯一型滤波器具有较高的透射率和较大的自由光谱范围（FSR），但具有更宽的FWHM。我们提出了由单一型和Lyot型结构组成的LCTF的新结构。复合的3级Solc和2级Lyot LCTF传输频谱是两种结构优点的组合。通过合理的结构设计，提高了光谱透射率，有效地减小了可见光谱中的二次透射峰。同时，通过加载不同幅度的驱动信号，可以在400nm至650nm的范围内对输出中心波长进行电可调。当将振幅为1.61V，1.45V和1.25V的驱动信号分别加载到LCTF的液晶单元上时，输出光谱的中心波长分别为433nm，510nm和595nm，分别对应于13nm，16nm的FWHM和22nm。

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