Ultra-long grating emitters for optical phased array leveraging subwavelength structures

Jiaxin Chen; Wanxin Li; Jiajun Tian; Yunxu Sun; Yong Yao; Xiaochuan Xu

doi:10.1117/12.2578392

5 March 2021 Ultra-long grating emitters for optical phased array leveraging subwavelength structures

Jiaxin Chen, Wanxin Li, Jiajun Tian, Yunxu Sun, Yong Yao, Xiaochuan Xu

Proceedings Volume 11692, Optical Interconnects XXI; 116920I (2021) https://doi.org/10.1117/12.2578392
Event: SPIE OPTO, 2021, Online Only

Abstract

Silicon photonics optical phased arrays have been studied intensively in recent years. As the divergence angle of the light beam is inversely proportional to the size of optical antennas, developing long grating emitters is crucial to the implementation of large aperture optical phased arrays. However, because of the high refractive index contrast between silicon and cladding materials on silicon-on-insulator (SOI) platform and fabrication limitation, the grating strength of a conventional grating is so strong that the light can only propagate a short distance within the grating. Because of the capability to engineer the macro optical properties of materials, subwavelength structures have become important building blocks in integrated photonics. In this paper, we propose subwavelength silicon segments as a promising approach to form long grating emitters. Subwavelength segments are placed a distanced away from a conventional waveguide to assure that they only interact with the evanescent wave of the guided mode. The grating strength can be tailored to any values of interest by optimizing the dimensions and positions of subwavelength segments. As a proof-ofconcept, a millimeter-long, through-etched grating and an apodized grating are designed and fabricated, which shows a divergence angle of 0.081 ° and 0.079°.

Conference Presentation

Citation Download Citation

Jiaxin Chen, Wanxin Li, Jiajun Tian, Yunxu Sun, Yong Yao, and Xiaochuan Xu "Ultra-long grating emitters for optical phased array leveraging subwavelength structures", Proc. SPIE 11692, Optical Interconnects XXI, 116920I (5 March 2021); https://doi.org/10.1117/12.2578392

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