Terahertz-wave generation from surface phonons at forbidden frequencies of lithium niobate

被引：1
|
作者：
Shikata, Jun-ichi [1 ]
Ohno, Seigo [2 ,3 ]
Minamide, Hiroaki [3 ]
机构：
[1] Nihon Univ, Coll Engn, Koriyama, Fukushima 9638642, Japan
[2] Tohoku Univ, Grad Sch Sci, Aoba Ku, Sendai, Miyagi 9808578, Japan
[3] RIKEN, Ctr Adv Photon RAP, Aoba Ku, Sendai, Miyagi 9800845, Japan
来源：
IEICE ELECTRONICS EXPRESS | 2020年 / 17卷 / 11期
关键词：
terahertz-wave generation; surface phonon; lithium niobate; negative permittivity; A(1) mode; TEMPERATURE; DIODES; EXCITATION; EMISSION; LINBO3; RANGE; GHZ;
D O I：
10.1587/elex.17.20200133
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper describes terahertz (THz)-wave generation within forbidden bands in polar crystals, focusing on the A(1) phonon modes in lithium niobate. This material exhibits two negative-permittivity frequency ranges at 7.4-12.7 THz and 18.8-25.6 THz for the lowest and highest A(1) modes, respectively. Exploiting the finite-difference time-domain simulations, we demonstrate that both the surface phonon modes can be radiative with a structured grating. Fourier analyses of the radiative fields reveal the relevant peaks in the spectrum as well as the dispersion relations. Our results provide a novel method for coherent THz-wave sources at unexplored THz frequencies.
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页数：5
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