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

Jun Ichi Shikata; Seigo Ohno; Hiroaki Minamide

doi:10.1587/ELEX.17.20200133

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

Jun Ichi Shikata, Seigo Ohno, Hiroaki Minamide

SCI - Physics

Research output: Contribution to journal › Article › peer-review

Abstract

This paper describes terahertz (THz)-wave generation within forbidden bands in polar crystals, focusing on the A₁ 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 A₁ 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.

Original language	English
Journal	IEICE Electronics Express
Volume	17
Issue number	11
DOIs	https://doi.org/10.1587/ELEX.17.20200133
Publication status	Published - 2020

Keywords

A mode
Lithium niobate
Negative permittivity
Surface phonon
Terahertz-wave generation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1587/ELEX.17.20200133

Cite this

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title = "Terahertz-wave generation from surface phonons at forbidden frequencies of lithium niobate",

abstract = "This paper describes terahertz (THz)-wave generation within forbidden bands in polar crystals, focusing on the A1 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 A1 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.",

keywords = "A mode, Lithium niobate, Negative permittivity, Surface phonon, Terahertz-wave generation",

author = "Shikata, {Jun Ichi} and Seigo Ohno and Hiroaki Minamide",

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doi = "10.1587/ELEX.17.20200133",

language = "English",

volume = "17",

journal = "IEICE Electronics Express",

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T1 - Terahertz-wave generation from surface phonons at forbidden frequencies of lithium niobate

AU - Shikata, Jun Ichi

AU - Ohno, Seigo

AU - Minamide, Hiroaki

N1 - Funding Information: This work is partly supported by JSPS KAKENHI Grant Numbers JP19K05286 and JP18K04967 as well as the co-operative research aid from RIKEN. Publisher Copyright: © 2020 The Institute of Electronics, Information and Communication Engineers

PY - 2020

Y1 - 2020

N2 - This paper describes terahertz (THz)-wave generation within forbidden bands in polar crystals, focusing on the A1 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 A1 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.

AB - This paper describes terahertz (THz)-wave generation within forbidden bands in polar crystals, focusing on the A1 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 A1 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.

KW - A mode

KW - Lithium niobate

KW - Negative permittivity

KW - Surface phonon

KW - Terahertz-wave generation

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JO - IEICE Electronics Express

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

Abstract

Keywords

ASJC Scopus subject areas

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