Spectral dependence of time-resolved photoreflectance of InN epitaxial films

Tsong-Ru Tsai; Cheng-Yu Chang; Chih-Wei Kuo; Jih-Shang Hwang; Tai-Yuan Lin; Shangjr Gwo
October 2009
Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p142108
Academic Journal
Femtosecond pulses at wavelengths ranging from 750 to 900 nm (1.38–1.65 eV) were used in the excitation and probing of ultrafast carrier dynamics in InN epitaxial films. Experimental results show that the hot electron relaxation rate increases with increasing electron energy, which is measured as E0.53. This observation agrees with the prediction of electron-electron scattering relaxation mechanism. In addition, the electron-hole recombination rates are independent of the electron energy and have values of ∼7×109 Hz. We attribute this result to the Auger recombination in InN being insensitive to temperature.


Related Articles

  • Development of a multiplex fast-scan system for ultrafast time-resolved spectroscopy. Yabushita, Atsushi; Yu-Hsien Lee; Kobayashi, Takayoshi // Review of Scientific Instruments;Jun2010, Vol. 81 Issue 6, p063110 

    A fast-scan method was developed to obtain time-resolved signals with femtosecond resolution over a picosecond range on the fly and in real time. Traditional fast-scan methods collect data at each probe wavelength one by one, which is time consuming and thus not possible for the study of...

  • Femtosecond continuum generation in bulk laser host materials with sub-μJ pump pulses. Bradler, M.; Baum, P.; Riedle, E. // Applied Physics B: Lasers & Optics;Nov2009, Vol. 97 Issue 3, p561 

    We report a comprehensive investigation of femtosecond continuum generation in single crystals of several common laser host materials. The absolute spectral energy density, pulse-to-pulse stability, pump threshold, and beam profile are studied in dependence on the focusing conditions, crystal...

  • Accounting for Auger yield energy loss for improved determination of molecular orientation using soft x-ray absorption spectroscopy. Genzer, Jan; Kramer, Edward J.; Fischer, Daniel A. // Journal of Applied Physics;12/15/2002, Vol. 92 Issue 12, p7070 

    Partial (Auger) yield near edge x-ray absorption fine structure (NEXAFS) is a structural analytical technique that has been primarily used to measure the spatial orientation and chemical bonding of small molecules on solid (i.e., inorganic or semiconductor) surfaces. In this article we...

  • Subpicosecond Double Electron Bunch Generation. Kimura, W. D.; Yakimenko, V. E.; Babzien, M.; Ding, X.; Kallos, E.; Kusche, K. P.; Pavlishin, I. V.; Pogorelsky, I. V.; Stolyarov, D.; Zhou, F. // AIP Conference Proceedings;2006, Vol. 877 Issue 1, p527 

    We have demonstrated creating two compressed electron beam bunches from a single 60-MeV bunch. Measurements indicate they have comparable bunch lengths (∼100–200 fs) and are separated in energy by ∼1.8 MeV with the higher-energy bunch preceding the lower-energy bunch by...

  • Ion induced chemical bonding of carbon with Ta as studied by Auger electron spectroscopy and.... Sharma, J.K.N.; Bera, Santanu; Chakraborty, B.R. // Applied Physics Letters;12/16/1991, Vol. 59 Issue 25, p3247 

    Examines the chemical bonding of carbon with tantalum (Ta) using Auger electron spectroscopy and slow electron energy loss spectroscopy (SEELS). Effect of carbide formation in Ta[sub 2]O[sub 5] films; Distinction of the SEELS of the Ta with graphitic carbon; Detection of carbide formation.

  • High-power ultrafast thin disk laser oscillators and their potential for sub-100-femtosecond pulse generation. Südmeyer, T.; Kränkel, C.; Baer, C. R. E.; Heckl, O. H.; Saraceno, C. J.; Golling, M.; Peters, R.; Petermann, K.; Huber, G.; Keller, U. // Applied Physics B: Lasers & Optics;Oct2009, Vol. 97 Issue 2, p281 

    Ultrafast thin disk laser oscillators achieve the highest average output powers and pulse energies of any mode-locked laser oscillator technology. The thin disk concept avoids thermal problems occurring in conventional high-power rod or slab lasers and enables high-power TEM00 operation with...

  • Blink and you'll miss it. Blackman, Greg // Electro Optics;Apr2012, Issue 222, p20 

    The article discusses the benefits of ultrafast lasers and the advantages that femtosecond lasers provide over picosecond devices. It notes that semiconductor-related sectors and micro-electronics are potential markets for ultrafast laser technology due to high precision requirements. It cites...

  • Microstructuring Tools for Sheet Bulk Metal Forming - A Designated Application for Picosecond Laser. Häfner, T.; Reg, Y.; Hetzner, H.; Schmidt, M. // Journal of Laser Micro / Nanoengineering;2013, Vol. 8 Issue 1, p39 

    In addition to coatings, microstructures can increase abrasion-resisting quality of sheet bulk metal forming tools by influencing friction conditions. The use of ultrashort pulsed lasers offers a possibility for manufacturing flexible microstructures with very high precision. Thus the processing...

  • Ultrafast rerouting of light via slow modes in a nanophotonic directional coupler. Kampfrath, T.; Beggs, D. M.; White, T. P.; Burresi, M.; van Oosten, D.; Krauss, T. F.; Kuipers, L. // Applied Physics Letters;6/15/2009, Vol. 94 Issue 24, p241119 

    We demonstrate that two coupled photonic-crystal waveguides can route two subsequently arriving light pulses to different output ports even though the pulses are only 3 ps apart. This rerouting of light is due to an ultrafast shift in the transmittance spectrum triggered by the generation of...


Read the Article


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

Try another library?
Sign out of this library

Other Topics