Characteristics of nanoscale composites by terahertz spectroscopy

Date

2003-07-29

Author

Altan, Hakan
Federici, John F
Lan, Aidong
Grebel, Haim

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

173
views

0
downloads

We have conducted visible pump-THz probe experiments on single wall carbon nanotubes (SWCNTs) on quartz substrates. Our results suggest an upper limit to the carrier-lifetime, which is on the order 1.5ps, limited only by the THz pulse duration. These experiments were repeated for ion-implanted, 3-4nm Si nanoclusters in quartz for which the carrier lifetime was also assessed at 1.5ps. THz time-domain spectroscopy (THz-TDS) of SWCNTs revealed that the THz pulse peak transmission changed under optical illumination.

Subject Keywords

Visible pump-THz probe, THz-TDS, Si Nano crystals, SWCNT

URI

https://hdl.handle.net/11511/35689

DOI

https://doi.org/10.1117/12.506898

Collections

Department of Physics, Conference / Seminar

Suggestions

OpenMETU
Core

Characteristics of nanoscale composites by THz spectroscopy Altan, Hakan; Federici, John F; Lan, Aidong; Grebel, Haim (2004-02-27) We have conducted visible pump-THz probe experiments on single wall carbon nanotubes (SWCNTs) deposited on quartz substrates. Our results suggest that the photoexcited nanotubes exhibit localized transport due to Lorentz-type photo-induced localized states. These experiments were repeated for ion-implanted, 3-4nm Si nanoclusters in quartz for which a similar behavior was observed.
Optical and electronic characteristics of single walled carbon nanotubes and silicon nanoclusters by tetrahertz spectroscopy Altan, Hakan; Federici, JF; Lan, AD; Grebel, H (2004-12-01) We have conducted visible pump-THz (THz-terahertz) probe measurements on single wall carbon nanotubes deposited on quartz substrates. Our results suggest that the photoexcited nanotubes exhibit localized transport due to Lorentz-type photoinduced localized states from 0.2 to 0.7 THz. Upon modeling the THz transmission through the photoexcited layer with an effective dielectric constant given by Maxwell-Garnett theory we found that the data are best fit by a broad Lorentz state at 0.5 THz. These experiments ...
Production of High-Performance CdZnTe Crystals Grown by THM for Radiation Detection Applications Ünal, Mustafa; Balbaşı, Özden Başar; Karaman, Mehmet Can; Genç, Ayşe Merve; Parlak, Mehmet; Turan, Raşit (2022-01-01) © 2022, The Minerals, Metals & Materials Society.CdZnTe crystals are the perfect candidate to be used in room temperature x-ray and gamma-ray detection systems. Production of detector-grade crystals, on the other hand, is challenging due to the unique properties of the CdZnTe. CdZnTe crystals are soft-brittle materials and have high ionicity of bonds that makes the growth process challenging. Among several growth techniques, the travelling heater method (THM) is a preferred growth method to obtain high-qual...
Electronic properties of open-ended single wall carbon nanotubes Turker, L; Erkoç, Şakir (2002-01-31) We have investigated the electrostatic, charge and orbital properties of open-ended single-wall carbon nanotubes in zigzag geometry. The calculations were performed by using the AM1-RHF semiempirical molecular orbital method. It has been found that the tubes with smaller radius behave like a metallic solid whereas the tubes with larger radius behave like a metallic hollow cylinder.
Efficient and accurate electromagnetic analysis of three-dimensional nano-optical structures Yazar, Şirin; Sür, Cem Gürkan; Solak, Birol; Eroğlu, Ömer; Altınoklu, Aşkın; Güler, Sadri; Gür, Uğur Meriç; Karaosmanoğlu, Barışcan; Ergül, Özgür Salih (2017-07-08) We present computational analysis of optical nanostructures, including but not limited to frequency-selective surfaces, metamaterials, nanoantennas, nanowires, and photonic crystals. A rigorous implementation based on surface integral equations and the multilevel fast multipole algorithm is developed for the analysis of such three-dimensional complex structures, without resorting to infinity, self-similarity, periodicity or homogeneity assumptions. The developed simulation environment provides accurate anal...

Citation Formats

H. Altan, J. F. Federici, A. Lan, and H. Grebel, “Characteristics of nanoscale composites by terahertz spectroscopy,” 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35689.