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Tunable terahertz reflection spectrum based on band gaps of GaP materials excited by ultrasonic

机译：基于GaP材料超声能隙的可调谐太赫兹反射光谱

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Tunable terahertz (THz) reflection spectrum, ranged from 0.2 to 8 THz, in band gaps of gallium phosphide (GaP) materials excited by ultrasonic is investigated in the present paper, in which tunable ultrasonic and terahertz wave collinear transmission in the same direction is postulated. Numerical simulation results show that, under the acousto-optic interaction, band gaps of transverse optical phonon polariton dispersion curves are turned on, this leads to a dis-propagation of polariton in GaP bulk. On the other side, GaP material has less absorption to THz wave according to experimental studies, as indicates that THz wave could be reflected by the band gaps spontaneously. The band gaps width and acousto-optic coupling strength are proportional with ultrasonic frequency and its intensity in ultrasonic frequency range of 0-250 MHz, in which low-frequency branch of transverse optical phonon polariton dispersion curves demonstrate periodicity and folding as well as. With the increase of ultrasonic frequency, frequency of band gap is blue-shifted, and total reflectivity decreased with -1-order and -2-order reflectivity decrease. The band gaps converge to the restrahlen band infinitely with frequency of ultrasonic exceeding over 250 MHz, total reflectivity of which is attenuated. As is show above, reflection of THz wave can be accommodated by regulating the frequency and its intensity of ultrasonic frequency. Relevant technology may be available in tunable THz frequency selection and filtering. (C) 2018 Elsevier B.V. All rights reserved.
机译：本文研究了在超声激发的磷化镓（GaP）材料的带隙中可调谐的太赫兹（THz）反射光谱，范围为0.2到8 THz，其中假定可调谐的超声波和太赫兹波共线传输在相同方向上。数值模拟结果表明，在声光相互作用下，横向光学声子极化子色散曲线的带隙被打开，这导致极化子在GaP体中的传播。另一方面，根据实验研究，GaP材料对太赫兹波的吸收较少，这表明太赫兹波可以自发地被带隙反射。带隙宽度和声光耦合强度与超声频率及其在0-250 MHz超声频率范围内的强度成正比，其中横向光学声子极化子色散曲线的低频分支也表现出周期性和折叠性。随着超声频率的增加，带隙频率发生蓝移，总反射率随着-1级和-2级反射率的​​降低而降低。当超声频率超过250 MHz时，带隙会无限地收敛到restrahlen带，其总反射率会衰减。如上所示，通过调节频率及其超声频率强度可以适应太赫兹波的反射。相关技术可用于可调THz频率选择和滤波。 （C）2018 Elsevier B.V.保留所有权利。

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