Enhanced broadband terahertz radiation generation near the reststrahlen band in sub-wavelength leaky-mode LiNbO3 waveguides

被引：10

作者：

Carnio, B. N. ^{[1
]}

Elezzabi, A. Y. ^{[1
]}

机构：

[1] Univ Alberta, Dept Elect Engn, Edmonton, AB T6G 2V4, Canada

来源：

OPTICS LETTERS | 2018年 / 43卷 / 08期

基金：

加拿大自然科学与工程研究理事会;

关键词：

FEMTOSECOND LASER-PULSES; CRYSTALS;

D O I：

10.1364/OL.43.001694

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The generation of terahertz (THz) radiation in a compact geometry is crucial for the implementation of on-chip, coherent THz radiation sources. Here, via numerical time-domain simulations, we show that LiNbO3 (LN) waveguides having sub-wavelength core widths can provide highly efficient optical-to-THz radiation frequency conversion over short lengths. By exploiting the nonlinear susceptibility, chi((2))(33), enhancement of LN near its phonon reststrahlen band and utilizing THz leaky-mode guidance to minimize reststrahlen band absorption and improve phase matching, we show that broadband (0.2-11.6 THz) electric field pulses of 3.4 kV/cm can be generated at an optical-to-THz conversion efficiency of 2.5 x 10(-4). These sub-wavelength leaky-mode waveguides provide a compact platform for wideband, coherent THz radiation sources. (C) 2018 Optical Society of America

引用

页码：1694 / 1697

页数：4

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