Unidirectional radiation control of quantum emitters coupled to spiral nano-antennas using optoelectronic material in near-infrared

Abstract

In this paper, we propose a new architecture of reconfigurable spiral nano-antenna utilized for the applications of modulators and switches by tailoring intensity, efficiency, and beam-steering. The property of real-time tuning is realized by DC-bias voltage applied to DAST layer as a lossless optoelectronic material. The proposed nano-antenna, coupled to a quantum emitter, is investigated and optimized using three-dimensional software with the FDFD method and parametric simulation. The numerical results show that altering bias voltage from -10 to 10 V tailors a unidirectional radiation pattern with a gain in the range of 5.54 to 0 dB. It is also shown the proposed array of spiral nano-antenna increases directivity to the 13.5 dB and rotates radiation pattern of the structure, equal as 24Deg using different bias voltages.