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Proceedings Paper

Parallel plate waveguide time domain spectroscopy to study terahertz conductivity of utltrathin materials
Author(s): Manjakavahoaka Razanoelina; Filchito R. Bagsican; Iwao Kawayama; Xiang Zhang; Lulu Ma; Hironaru Murakami; Robert Vajtai; Pulickel M. Ajayan; Junichiro Kono; Daniel M. Mittleman; Masayoshi Tonouchi
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Paper Abstract

The newly discovered atomically thin and layered materials which host electronic system that respond to longwavelength light in extraordinary manner can lead to a major breakthrough in the field of terahertz (THz) optics and photonics. However, their low conductivities due to either low densities or low mobility make it challenging to characterize their basic THz properties with the standard spectroscopic method. Here, we develop a THz spectroscopic technique based on parallel plate waveguide (PPWG) to overcome the limitations of the conventional THz time domain spectroscopy (TDS) technique. The present method is particularly suitable to ultrathin conductive materials with low carrier density. We report in details the derivation of the dispersion equations of the terahertz wave propagation in a PPWG loaded by a thin conductive materials with zero-thickness. These dispersion equations for transverse magnetic (TM) and transverse electric (TE) waveguide modes are the core of the optical parameters extraction algorithm in the THz-PPWG-TDS analysis. We demonstrate the effectiveness of the waveguide approach by characterizing low conductive CVD graphene. The high sensitivity of THz-PPWG-TDS technique enables us to study the carrier dynamics in graphene with Drude and Drude-Smith model.

Paper Details

Date Published: 29 April 2016
PDF: 9 pages
Proc. SPIE 9856, Terahertz Physics, Devices, and Systems X: Advanced Applications in Industry and Defense, 985605 (29 April 2016); doi: 10.1117/12.2225060
Show Author Affiliations
Manjakavahoaka Razanoelina, Osaka Univ. (Japan)
Filchito R. Bagsican, Osaka Univ. (Japan)
Iwao Kawayama, Osaka Univ. (Japan)
Xiang Zhang, Rice Univ. (United States)
Lulu Ma, Rice Univ. (United States)
Hironaru Murakami, Osaka Univ. (Japan)
Robert Vajtai, Rice Univ. (United States)
Pulickel M. Ajayan, Rice Univ. (United States)
Junichiro Kono, Osaka Univ. (Japan)
Rice Univ. (United States)
Daniel M. Mittleman, Osaka Univ. (Japan)
Brown Univ. (United States)
Masayoshi Tonouchi, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 9856:
Terahertz Physics, Devices, and Systems X: Advanced Applications in Industry and Defense
Mehdi F. Anwar; Thomas W. Crowe; Tariq Manzur, Editor(s)

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