Ultrahigh-resolution photonic-crystal superprism and method for designing the same

US10274642B2 · kind B2 · utility

Assignees

• SHANGHAI INSTITUTE OF MICROSYSTEM AND INFORMATION TECHNOLOGY CHINESE ACADEMY OF SCIENCES · CN
• FUDAN UNIVERSITY · CN

Inventors

• Xunya Jiang · Shanghai, CN
• Wei Li · Shanghai, CN
• Xiaogang Zhang · Novi, US
• Xulin Lin · Tangxia, CN

Key dates

• Filing date: Feb 4, 2015
• Grant date: Apr 30, 2019
• Expiry date: Mar 12, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B27/126
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for designing an ultrahigh-resolution photonic-crystal superprism, including the following steps: selecting a medium material, and determining a structure type and parameter of a photonic crystal, obtaining the photonic crystal's equifrequency graph, and looking for an auto-collimation area; obtaining the group velocity distribution of points in the equifrequency graph, and looking for a low group velocity area; optimizing the photonic crystal's structure parameter, facilitating the auto-collimation and the low group velocity area in the photonic crystal's equifrequency graph to be overlapped as much as possible, and defining overlapping area as a work area; obtaining an equal incidence-angle line, rotating the photonic crystal to intersect the equal incidence-angle line with the work area, and selecting the appropriate incidence angle in an intersection point to complete the design of the photonic-crystal superprism. When light makes incidence via the above incidence angle, the photonic crystal may separate light with different frequencies significantly.