Characterization of Low Dimensional Materials by Raman Spectroscopy

This article reviews recent advances in the Raman scattering study of one- and two-dimensional materials. The characteristic vibrational properties of the low dimensional crystals are described and various methods of characterizing these crystals are summarized. Recent experimental results on polymer crystals, inorganic chain-like crystals, layered crystals and intercalated layer crystals are presented

Analysis and design of planar dipole array for terahertz magnetic surface wave propagation

A planar dipole array on low-temperature (LT) growth gallium arsenide (GaAs) or cyclo olefin polymer film is analyzed for magnetic terahertz surface wave, TE wave propagation. A laser pulse excites the dipole gap in order to generate photo carriers on the surface of a LT-GaAs photoconductive substrate. A dipole array on the LT-GaAs substrate is designed for a surface wave around 0.40 THz. The analysis also derives the dispersion diagram and transmission loss. The dispersion diagram indicates that propagation of the surface wave is confined around the dipole elements. The dipole array on a cyclo olefin polymer film can be also designed at around 0.45 THz.Masaki Yashiro, Withawat Withayachumnankul, John C. Young, Keisuke Takano, Masanori Hangyo, Takehito Suzukihttp://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=666539

Phase measurement interferometric microscopy of stacked fishnet metamaterials

SPIE OPTO, 2012, San Francisco, California, Unitd StatesT. Matsui, A. Miura, T. Nomura, H. Fujikawa, K. Sato, N. Ikeda, D. Tsuya, M. Ochiai, Y. Sugimoto, H. T. Miyazaki, M. Ozaki, M. Hangyo, and K. Asakawa "Phase measurement interferometric microscopy of stacked fishnet metamaterials", Proc. SPIE 8269, Photonic and Phononic Properties of Engineered Nanostructures II, 82692P (22 February 2012) DOI: https://doi.org/10.1117/12.90724

Low-energy charge dynamics in La0.7_{\text{0.7}}Ca0.3_{\text{0.3}}MnO3_{\text3}: THz time-domain spectroscopic studies

Direct experimental estimations of the low-energy ($1.5\sim10$ meV) complex dielectric constants spectrum and its temperature variation have been investigated for La$_{0.7}$Ca$_{0.3}$MnO$_3$ thin films using terahertz time-domain spectroscopy. At low temperatures, a clear Drude-term emerges. With increasing temperature, the scattering rate increases, while the plasma frequency decreases, derived both from a simple Drude model. Finally, a Drude-term submerges well below the insulator-metal transition temperature. On the basis of the present results, low-energy charge dynamics are discussed.Comment: REVTeX 13 pages, 3 figure