Reduction of phonon resonant terahertz wave absorption in photoconductive switches using epitaxial layer transfer

Kasai, S.; Katagiri, T.; Takayanagi, J.; Kawase, K.; Ouchi, T.
March 2009
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p113505
Academic Journal
A broadband terahertz time-domain spectroscopy (TDS) system for frequencies of up to 15 THz, including the phonon resonance frequency range, has been developed using a transferred thin-film photoconductive switch (PCS) detector. The thin-film PCSs, based on low-temperature-grown GaAs, were fabricated using epitaxial layer transfer onto high-resistivity Si substrates. We observed a reduction of phonon resonant absorption, including between 7 and 10 THz, in a forward radiation configuration. Numerically calculated absorption spectra show good agreement with our experimental results. This technique will provide compact, broadband TDS systems.


Related Articles

  • Terahertz spectroscopy of central and soft phonon modes in LuFe2O4. Li, S. Z.; Luo, S. J.; Fu, R.; Jin, B. B.; Wang, K. F.; Liu, J.-M.; Ding, J. F.; Li, X. G. // Applied Physics A: Materials Science & Processing;Sep2009, Vol. 96 Issue 4, p893 

    The terahertz dielectric response of LuFe2O4 is investigated by terahertz time-domain spectroscopy over a temperature range of 6–290 K. It is revealed that besides the central mode associated with the charge-ordered state, a soft TO1 mode at below ∼240 K is identified indicating the...

  • Growth of nanosize Ag dots with uniform height on a Si(111)-7×7-C2H5OH surface, and their electronic properties. Xiaohong Jiang; Zhaoxiong Xie; Shimojo, Masayuki; Tanaka, Ken-ichi // Applied Physics A: Materials Science & Processing;Nov2009, Vol. 97 Issue 3, p567 

    C2H5OH adsorbs by dissociating on Si-adatom/Si-rest atom pair sites on Si(111)-7×7 surfaces. A half of six Si adatoms and three Si rest atoms are changed to Si-OC2H5 and Si-H in every half unit cell at the saturation. When an Ag atom was deposited on this surface, it was stabilized on an...

  • Effects of spatial coherence distortion on terahertz time-domain spectroscopy. Théberge, Francis; Châteauneuf, Marc; Dubois, Jacques // Applied Physics Letters;5/5/2008, Vol. 92 Issue 18, p183501 

    This letter reports the impacts of the spatial coherence distortion on the measured absorption spectra and the identification of materials analyzed by terahertz time-domain spectroscopy. It is shown that the deformation of the terahertz beam wave front can result into the overestimation of the...

  • Predicting Cold Flow Properties of Diesel by Terahertz Time-Domain Spectroscopy. Hui Zhao; Kun Zhao; Rima Bao // ISRN Spectroscopy;2012, p1 

    The frequency-dependent absorption characteristics of conventional diesel fuel have been researched in the spectral range of 0.2- 1.5 THz by the terahertz time-domain spectroscopy (THz-TDS). The absorption coefficient increased monotonically with the solidifying point of diesel. A nonlinear...

  • Terahertz remote sensing uses 'all-optical' fluorescence manipulation technique. Overton, Gail // Laser Focus World;Aug2010, Vol. 46 Issue 8, p20 

    The article discusses the all-optical fluorescence manipulation technique developed by the researchers at Rensselaer Polytechnic Institute in New York, and Laval University in Quebec. It outlines the functionality of the method which resolves terahertz pulses at standoff distances up to 10...

  • Generation and detection of ultrabroadband terahertz radiation using photoconductive emitters and receivers. Shen, Y. C.; Upadhya, P. C.; Beere, H. E.; Linfield, E. H.; Davies, A. G.; Gregory, I. S.; Baker, C.; Tribe, W. R.; Evans, M. J. // Applied Physics Letters;7/12/2004, Vol. 85 Issue 2, p164 

    We report the coherent generation and detection of ultrabroadband terahertz (THz) radiation using low-temperature-grown GaAs photoconductive antennas as both emitters and receivers. THz radiation with frequency components over 15 THz was obtained, the highest reported for a THz time-domain...

  • Self-consistent determination of the generation rate from photoconductance measurements. Trupke, T.; Bardos, R.A. // Applied Physics Letters;10/18/2004, Vol. 85 Issue 16, p3611 

    The determination of effective excess carrier lifetimes from photoconductance measurements generally requires knowledge of the absolute generation rate within a sample. Measurements of the generation rate typically involve measurement of the sample absorption spectrum and of the incident light...

  • Terahertz Study of Electromagnon in TbMnO3 (abstract). Seonghoon Jung; Jaehoon Noh; Kim joo-youn; Inhee Maeng; Seung Jae Oh; Joo-Hiuk Son; Cheong, S. W.; Choi, E. J. // AIP Conference Proceedings;4/19/2009, Vol. 1119 Issue 1, p221 

    Pimenov et al. observed a new far-infrared optical resonance in orthorhombic RMnO3 (R = Dy, Tb, Gd) in the spiral-spin ferroelectric phase at T

  • Optical spectra of strong-coupling polarons. Myasnikov, É.; Myasnikova, A.; Mastropas, Z. // Physics of the Solid State;Jun2006, Vol. 48 Issue 6, p1046 

    The photodissociation spectra of Landau-Pekar polarons are calculated using the theory of quantum coherent states. It is shown that the number of phonons emitted in one dissociation event can differ and that their energy is equal to the doubled polaron binding energy E p only on the average. It...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics