TITLE

Dual-frequency quantum-cascade terahertz emitter

AUTHOR(S)
Menon, V. M.; Goodhue, W. D.; Karakashian, A. S.; Naweed, A.; Plant, J.; Ram-Mohan, L. R.; Gatesman, A.; Badami, V.; Waldman, J.
PUB. DATE
April 2002
SOURCE
Applied Physics Letters;4/8/2002, Vol. 80 Issue 14, p2454
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report the realization of a GaAs/AlGaAs quantum-cascade terahertz emitter capable of emitting at two entirely different frequencies from the same structure. This is realized through judicious wavefunction engineering of the relevant electronic states. Emission is observed at 6.32 meV (1.5 THz) and 12.18 meV (2.9 THz) with full width at half maximum of 0.72 meV and 0.58 meV, respectively, at T=10 K. The structure consisted of 40 periods of the quantum-cascade module. Emission occurred between two sets of distinct energy levels that came into the desired configuration at different biases due to the quantum-confined Stark effect. Higher-energy AlAs-like phonons were utilized for the depopulation mechanism. © 2002 American Institute of Physics.
ACCESSION #
6427098

 

Related Articles

  • A comparison using a delta-function model of envelope function approximations for quantum wells. Cunningham, Thomas; Barker, R. C.; Chiu, L. C. // Journal of Applied Physics;6/1/1988, Vol. 63 Issue 11, p5393 

    Presents a study which compared versions of the effective-mass approximation to the exact atomic wave function in predicting the energies of the bound states in a single quantum well. Details on studies of bound states in thin heterojunction quantum wells; Properties of a delta-function...

  • Exciton binding energy as a function of the well width. Hrivnák, Lˇ. // Journal of Applied Physics;10/1/1992, Vol. 72 Issue 7, p3218 

    Presents a study which proposed an empirical formula for the binding energy of an electron-heavy-hole excitation which modified the known formula for the Wannier exciton binding energy. Description of the binding energy of the Wannier exciton; Characteristics of the quantum well; Comparison of...

  • Control of quantum well states in Ag/Fe(100) and Au/Fe(100). Ogawa, S.; Terada, Y.; Heiki, S.; Hashizume, T.; Ito, K. // Journal of Applied Physics;6/1/2004, Vol. 95 Issue 11, p6894 

    The quantum well (QW) energy dependence on the vacuum boundary condition is studied in Ag/Fe(100) and Au/Fe(100). With decreasing of the vacuum level by evaporating Cs atoms, the energy shift and broadening of the QW states are observed by one-photon photoemission spectra, which is well...

  • Well-width dependence of the ground level emission of GaN/AlGaN quantum wells. Bonfiglio, A.; Lomascolo, M. // Journal of Applied Physics;3/1/2000, Vol. 87 Issue 5, p2289 

    Presents information on a study which investigated the well-width dependence of the ground level emission energy of GaN/AlGaN quantum wells. Materials and methods of the experiment; Results and discussion.

  • Determining energy-band offsets in quantum wells using only spectroscopic data. Koteles, Emil S. // Journal of Applied Physics;6/15/1993, Vol. 73 Issue 12, p8480 

    Develops an experimental technique for accurately determining energy-band offsets in semiconductor quantum wells. Cause of the energy difference between ground-state light-hole and heavy hole energies; Problems associated with the characterization of semiconductor quantum wells; Effect of...

  • Influence of image charge effect on exciton fine structure in an organic-inorganic quantum well material. Arai, Yuko; Yajima, Chieko; Inoue, Masaya; Kunugita, Hideyuki; Ema, Kazuhiro // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p435 

    We have investigated the 2s-2p splitting of excitons in an organic-inorganic hybrid quantum well material, (C4H9NH3)2PbBr4, by measuring one-photon and two-photon excitation spectra. Generally, energy level of 2s is lower than that of 2p for usual Wannier excitons because of the polaron effect....

  • The over-barrier resonant states and multi-channel scattering by a quantum well. Polupanov, Alexander F.; Galiev, Vjacheslav I.; Kruglov, Alexis N. // International Journal of Multiphysics;Jun2008, Vol. 2 Issue 2, p171 

    We demonstrate an explicit numerical method for accurate calculation of the analytic continuation of the scattering matrix, describing the multichannel scattering by a quantum well, to the unphysical region of complex values of the energy. Results of calculations show that one or several poles...

  • Experimental evidence on quantum well–quantum dash energy transfer in tunnel injection structures for 1.55 μm emission. Polish_hook, G.; Poloczek, P.; Podemski, P.; Kudrawiec, R.; Misiewicz, J.; Somers, A.; Hein, S.; Höfling, S.; Forchel, A. // Applied Physics Letters;2/19/2007, Vol. 90 Issue 8, p081915 

    Here comes a report on the investigation of the energy transfer in InP-based tunnel injection structures, consisting of InAs/InAlGaAs quantum dashes (QDashes) and an InGaAs/InAlGaAs quantum well (QW), designed for 1.55 μm emission at room temperature. Temperature dependent photoluminescence...

  • Experimental demonstration of the polarization-dependent photon-mediated carrier redistribution in tunneling injection InP quantum-dot lasers with external-grating feedback. Kim, J.; Kondratko, P. K.; Chuang, S. L.; Walter, G.; Holonyak, N.; Heller, R. D.; Zhang, X. B.; Dupuis, R. D. // Applied Physics Letters;5/21/2007, Vol. 90 Issue 21, p211102 

    Measured modal gain spectra of the tunneling injection InP quantum-dot (QD) laser with and without an external feedback are presented to experimentally demonstrate the polarization-dependent photon-mediated carrier redistribution in the tunneling injection QD laser. The peak gain wavelength in...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics