Terahertz dielectric properties and low-frequency phonon resonances of ZnO nanostructures

Jiaguang Han; Weili Zhang; Wei Chen; Sanith Ray; Jun Zhang; Mingxia He; Abul K. Azad; Zhiyuan Zhu

doi:10.1021/jp073343t

Terahertz dielectric properties and low-frequency phonon resonances of ZnO nanostructures

Jiaguang Han, Weili Zhang^*, Wei Chen, Sanith Ray, Jun Zhang, Mingxia He, Abul K. Azad, Zhiyuan Zhu

^*Corresponding author for this work

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

33 Citations (Scopus)

Abstract

Far-infrared optical and dielectric properties of nanostructured ZnO of different morphologies are characterized by terahertz time-domain spectroscopy. Frequency-dependent complex dielectric function, power absorption, and refractive index are experimentally measured in the terahertz regime. The results are analyzed and well fit with dielectric theories combined with effective medium models. Different ZnO nanostructure morphologies exhibit different characteristics due to diverse resonance mechanisms dominated by either free electrons or phonons. The dielectric function of tubular and prismlike ZnO structures exhibits the Drude-like behavior, while it is dominated by the low-frequency phonon resonances for nanowires. Additionally, the overall low-frequency phonon resonances of these nanostructures are measured by Raman scattering spectroscopy, showing good consistency with those of bulk wurtzite single-crystal ZnO.

Original language	English
Pages (from-to)	13000-13006
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	35
DOIs	https://doi.org/10.1021/jp073343t
Publication status	Published - 6 Sept 2007
Externally published	Yes

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title = "Terahertz dielectric properties and low-frequency phonon resonances of ZnO nanostructures",

abstract = "Far-infrared optical and dielectric properties of nanostructured ZnO of different morphologies are characterized by terahertz time-domain spectroscopy. Frequency-dependent complex dielectric function, power absorption, and refractive index are experimentally measured in the terahertz regime. The results are analyzed and well fit with dielectric theories combined with effective medium models. Different ZnO nanostructure morphologies exhibit different characteristics due to diverse resonance mechanisms dominated by either free electrons or phonons. The dielectric function of tubular and prismlike ZnO structures exhibits the Drude-like behavior, while it is dominated by the low-frequency phonon resonances for nanowires. Additionally, the overall low-frequency phonon resonances of these nanostructures are measured by Raman scattering spectroscopy, showing good consistency with those of bulk wurtzite single-crystal ZnO.",

author = "Jiaguang Han and Weili Zhang and Wei Chen and Sanith Ray and Jun Zhang and Mingxia He and Azad, {Abul K.} and Zhiyuan Zhu",

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AU - Han, Jiaguang

AU - Zhang, Weili

AU - Chen, Wei

AU - Ray, Sanith

AU - Zhang, Jun

AU - He, Mingxia

AU - Azad, Abul K.

AU - Zhu, Zhiyuan

PY - 2007/9/6

Y1 - 2007/9/6

N2 - Far-infrared optical and dielectric properties of nanostructured ZnO of different morphologies are characterized by terahertz time-domain spectroscopy. Frequency-dependent complex dielectric function, power absorption, and refractive index are experimentally measured in the terahertz regime. The results are analyzed and well fit with dielectric theories combined with effective medium models. Different ZnO nanostructure morphologies exhibit different characteristics due to diverse resonance mechanisms dominated by either free electrons or phonons. The dielectric function of tubular and prismlike ZnO structures exhibits the Drude-like behavior, while it is dominated by the low-frequency phonon resonances for nanowires. Additionally, the overall low-frequency phonon resonances of these nanostructures are measured by Raman scattering spectroscopy, showing good consistency with those of bulk wurtzite single-crystal ZnO.

AB - Far-infrared optical and dielectric properties of nanostructured ZnO of different morphologies are characterized by terahertz time-domain spectroscopy. Frequency-dependent complex dielectric function, power absorption, and refractive index are experimentally measured in the terahertz regime. The results are analyzed and well fit with dielectric theories combined with effective medium models. Different ZnO nanostructure morphologies exhibit different characteristics due to diverse resonance mechanisms dominated by either free electrons or phonons. The dielectric function of tubular and prismlike ZnO structures exhibits the Drude-like behavior, while it is dominated by the low-frequency phonon resonances for nanowires. Additionally, the overall low-frequency phonon resonances of these nanostructures are measured by Raman scattering spectroscopy, showing good consistency with those of bulk wurtzite single-crystal ZnO.

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Terahertz dielectric properties and low-frequency phonon resonances of ZnO nanostructures

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