Double-Resolved Beam Steering by Metagrating-Based Tamm Plasmon Polariton

We consider Tamm plasmon polariton in a subwavelength grating patterned on top of a Bragg reflector. We demonstrate dynamic control of the phase and amplitude of a plane wave reflected from such metagrating due to resonant coupling with the Tamm plasmon polariton. The tunability of the phase and amplitude of the reflected wave arises from modulation of the refractive index of a transparent conductive oxide layer by applying the bias voltage. The electrical switching of diffracted beams of the +/- 1st order is shown. The possibility of doubling the angular resolution of beam steering by using asymmetric reflected phase distribution with integer and half-integer periods of the metagrating is demonstrated.

Automated summary

This research demonstrates that the phase and amplitude of a plane wave reflected from a subwavelength grating on top of a Bragg reflector can be dynamically controlled by modulating the refractive index of a transparent conductive oxide layer. The study also shows the electrical switching of diffracted beams and the possibility of doubling the angular resolution of beam steering using an asymmetric reflected phase distribution.