Asymmetric optical transmission based on unidirectional excitation of surface plasmon polaritons in gradient metasurface

作者：Ling, Yonghong; Huang, Lirong^*; Hong, Wei; Liu, Tongjun; Sun, Yali; Luan, Jing; Yuan, Gang

来源：Optics Express, 2017, 25(12): 13648-13658.

DOI：10.1364/OE.25.013648

• SUBWAVELENGTH OPTICS
• LIGHT-PROPAGATION
• META-SURFACES
• REFLECTION
• REFRACTION
• ISOLATOR
• DIODE
• WAVES

Asymmetric optical transmission is fundamental and highly desirable in information processing and full manipulation of lightwave. We here propose an asymmetric optical transmission device consisting of a gradient metasurface and a one-dimensional subwavelength grating. Owing to the unidirectional excitation of surface plasmon polaritons (SPPs) by the gradient metasurface, and SPP-assisted extraordinary optical transmission, forward incident light has much higher transmission than the backward one. We combine temporal coupled mode theory and finite-difference time-domain simulations to verify its operation principle and study the performance. The results indicate that asymmetric transmission With high-contrast and large for transmittance can be obtained around the 1.3 mu m optical communication band.

• 出版日期2017-6-12
• 单位华中科技大学