Wide-angle resonance of a photonic crystal surface mode under a surface termination and its influence on imaging. (6th December 2016)

• Record Type: Journal Article
• Authors: Hu, Hengrun; Liu, Hongmei; Qing, Yun; Cheng, Lu-Teng; Song, Weiwei; Yang, Xu; Jiang, Wei; Rao, Wei-Feng
• Is Part Of: Journal of optics. Volume 19:Number 1(2017:Jan.)
• Publication Date: 2016-12-06
• Subjects: photonic crystal -- modulation transfer function -- subwavelength structures; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8986/19/1/015101
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: We have developed a semi-analytical approach to the modulation transfer function (MTF) for negative-index flat lenses based on photonic crystals (PhCs). Contributions of various PhC modes to the MTF have been identified and analyzed. With a certain surface termination, a high-order PhC surface mode can be tamed to produce a broad angular resonance. As such, the isotropy of the image field can be significantly enhanced, resulting in an ideal image formation with nearly perfect outgoing circular wavefronts. Ray-optics analysis has also been utilized to assist the design of a negative-index flat lens. Finite-difference time domain simulations confirm the effectiveness of PhC lens designed by this semi-analytic approach to the MTF.