Design of Waveguide Polarization Convertor Based on Asymmetric 1D Photonic Crystals

• Published in: Nanomaterials (Basel, Switzerland) Vol. 12; no. 14; p. 2454
• Main Authors: Hsiao, Fu-Li, Ni, Chia-Ying, Tsai, Ying-Pin, Chiang, Ting-Wei, Yang, Yen-Tung, Fan, Cheng-Jui, Chang, Hsuan-Ming, Chen, Chien-Chung, Lee, Hsin-Feng, Lin, Bor-Shyh, Chan, Kai-Chun, Chen, Chii-Chang
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 18.07.2022; MDPI
• Subjects: Circuits; Crystal structure; Crystals; Design; Electric fields; Insertion loss; integrated optics; Light; Light transmission; Optical components; optical polarization; Photonic crystals; Polarization; Quantum computing; Rotation; Waveguides
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano12142454

Photonic crystals possess metastructures with a unique dispersion relation. An integrated optical circuit plays a crucial role in quantum computing, for which miniaturized optical components can be designed according to the characteristics of photonic crystals. Because the stable light transmission mode for a square waveguide is transverse electric or transverse magnetic polarization, we designed a half-waveplate element with a photonic crystal that can rotate the polarization direction of the light incident on a waveguide by 90°. Using the dispersion relation of photonic crystals, the polarization rotation length and the optical axis’s angle of deviation from the electric field in the eigenmode can be effectively calculated. Polarization rotators designed on the basis of photonic crystal structures can effectively reduce the insertion loss of components and exhibit favorable polarization rotation performance.