Abstract
In this paper, we proposed a two ports coherent perfect absorber based on antisymmetric metasurface with gain material which is able to effectively regulate the absorption of the coherent incident wave under the condition of unequal incident intensities. This design overcomes the limitation that exists in the previous coherent controller which can only be applied to coherent light of equal intensity without gain material. In the proposed absorber, the metal strips of different lengths are arranged in an antisymmetric manner on the interlayer, a gain material layer is introduced to regulate the unequal intensity coherent light and the electromagnetic response mode which can be selectively strengthened and weakened by modulating the phase difference between two incident waves, and a high coherent absorption under the condition of asymmetric incident wave can be realized. Results show that the proposed absorber achieve coherent perfect absorption at the frequency of 15.25 THz and 17.75 THz, which can change the total absorption in the range from 27.41% to 98.55%, and from 27.55% to 97.88%, respectively. This paper may serve as an important tool for all-optical information transmission and data processing.
Highlights
With the development of optical fiber communication [1], the disadvantages of electronic devices such as power consumption and low efficiency are gradually exposed, resulting in the phenomenon of electronic bottleneck in communication network [2]
In this paper, we proposed a two ports coherent perfect absorber based on antisymmetric metasurface with gain material which is able to effectively regulate the absorption of the coherent incident wave under the condition of unequal incident intensities
We propose an absorber based on metasurface with gain material that allow the regulation of the absorption rate of a strong signal beam by using a weaker control beam
Summary
With the development of optical fiber communication [1], the disadvantages of electronic devices such as power consumption and low efficiency are gradually exposed, resulting in the phenomenon of electronic bottleneck in communication network [2]. In the framework of classical electrodynamics, this superposition principle for electromagnetic waves in vacuum or interacting internally has not been challenged [6], [7] and researchers have used a strong laser field to promote the beam interaction in nonlinear media To overcome this difficulties, coherent control technology provides a new method to control the interaction between optical materials and electromagnetic fields. We propose an absorber based on metasurface with gain material that allow the regulation of the absorption rate of a strong signal beam by using a weaker control beam This design is composed of rectangular metal strips of different lengths carried by two layers of silicon and gain medium and antisymmetric which on both sides. By adjusting the phase difference between the incident waves, the coherent proposed absorber can achieve coherent perfect absorption at the frequency of 15.25 THz and 17.75 THz and changing in the range from 27.41% to 98.55%, and from 27.55% to 97.88%, respectively
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