Abstract

We present a design for tunable directional beaming through a subwavelength metallic double slit surrounded by dielectric surface-relief gratings. On-axis and off-axis beaming can be switched by controlling the incident angle to asymmetrically excite surface plasmon polaritons (SPPs) that are subsequently coupled out to propagating beams by the two gratings on the left and the right sides of the double slit. Furthermore, the division of optical power into two off-axis beaming directions can be tuned smoothly by varying the incident angle while keeping the total power almost unchanged. The mechanism of this effect is analyzed theoretically and verified using rigorous numerical simulations.

© 2012 Chinese Optics Letters

Tunable directional beaming from subwavelength metal slits with metal–dielectric composite surface gratings

Hwi Kim, Junghyun Park, and Byoungho Lee
Opt. Lett. 34(17) 2569-2571 (2009)

Direction-tunable enhanced emission from a subwavelength metallic double-nanoslit structure

Xiaohong Song, Nini Wang, Ming Yan, Cheng Lin, Jens Förstner, and Weifeng Yang
Opt. Express 25(12) 13207-13214 (2017)

Reconfigurable multifrequency and wide-angle directional beaming of light from a subwavelength metal slit with graphene metasurfaces

Zezhao Ju, Ming Deng, Jian Wang, and Lin Chen
Opt. Lett. 45(10) 2882-2885 (2020)

Directional coupling of surface plasmon polaritons using single nano-slit with asymmetric sidewall structure and material composition

Chong-Cin Hou and Hung-Chih Kan
Opt. Express 28(4) 4741-4750 (2020)

Spoof-plasmon relevant one-way collimation and multiplexing at beaming from a slit in metallic grating

Semih Cakmakyapan, Andriy E. Serebryannikov, Humeyra Caglayan, and Ekmel Ozbay
Opt. Express 20(24) 26636-26648 (2012)