Abstract
This study proposes a unidirectional perfect absorber (UPA), which we realized with a two-arm Aharonov-Bohm interferometer, that consists of a dissipative resonator side-coupled to a uniform resonator array. The UPA has reflection-less full absorption on one direction, and reflectionless full transmission on the other, with an appropriate magnetic flux and coupling, detuning, and loss of the side-coupled resonator. The magnetic flux controls the transmission, the left transmission is larger for magnetic flux less than one-half flux quantum; and the right transmission is larger for magnetic flux between one-half and one flux quantum. Besides, a perfect absorber (PA) can be realized based on the UPA, in which light waves from both sides, with arbitrary superposition of the ampli- tude and phase, are perfectly absorbed. The UPA is expected to be useful in the design of novel optical devices.
Highlights
Realized with appropriate coupling, detuning, loss values, and the magnetic flux of the two-arm AB interferometer
This study proposed a two-arm AB interferometer as a UPA, where light beams pass in a unidirectional manner
The AB interferometer consists of a side-coupled dissipative resonator, with an enclosed synthetic magnetic flux, which controls the light flow
Summary
Realized with appropriate coupling, detuning, loss values, and the magnetic flux of the two-arm AB interferometer. We show that with an appropriate magnetic flux and side-coupled resonator coupling, detuning, and loss values, the AB interferometer displays reflectionless full absorption in one direction and full transmission in the other, r L (R) = tL (R) = r R (L) = 0,tR (L) = 1.
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