Terahertz spectra and soft optical phonons of PbB4O7 crystal | Zendy

Peizhen Fu | Zendy; Hou Bi-Hui | Zendy; Li Wang | Zendy; Zhong Renbin | Zendy; Wang Ya-li | Zendy; Erpan Zhang | Zendy; Jian Yan-zhen | Zendy

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Terahertz spectra and soft optical phonons of PbB4O7 crystal

Author(s) -

Peizhen Fu,

Hou Bi-Hui,

Li Wang,

Zhong Renbin,

Wang Ya-li,

Erpan Zhang,

Jian Yan-zhen

Publication year - 2010

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.59.4640

Subject(s) - phonon , crystal (programming language) , polariton , raman spectroscopy , materials science , terahertz radiation , raman scattering , optics , resonance (particle physics) , dispersion (optics) , dielectric , dispersion relation , spectral line , attenuation coefficient , molecular physics , condensed matter physics , physics , atomic physics , optoelectronics , astronomy , computer science , programming language

The terahertz(1012Hz)spectra, Raman spectra and infrared-visible-UV spectra are analyzed for PbB4O7 crystal sample. A resonance peak appears in the curve of the dielectric function ε(ν) in the frequency range of 0.25—2.5 THz. The analysis supports that soft optical phonons exist in PbB4O7 crystal from four aspects: 1) the change curve ε(ν) of the dielectric function satisfies the Lyddane-Sachs-Teller relation; 2) a strong Raman scattering peak appears in the vicinity of resonance frequency (3.10 THz); 3) absorption coefficient curve α(ν) meets the characteristics of polaritons; 4) the dispersion relation curve ν(k) of the photon transmitting from the crystal reveals a frequency gap. The soft optical phonon exists in PbB4O7 crystal, which means that the frequency curve of the photon transmitting from the crystal will suffer splitting when the condition of producing polariton is satisfied. And the dispersion curve splits a higher branch and a lower one. This may help us find a new method of changing the frequency of the photon.

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