Temperature performance analysis of terahertz quantum cascade lasers: Vertical versus diagonal designs

Mátyás, Alpár; Belkin, Mikhail A.; Lugli, Paolo; Jirauschek, Christian
May 2010
Applied Physics Letters;5/17/2010, Vol. 96 Issue 20, p201110
Academic Journal
Resonant phonon depopulation terahertz quantum cascade lasers based on vertical and diagonal lasing transitions are systematically compared using a well established ensemble Monte Carlo approach. The analysis shows that for operating temperatures below 200 K, diagonal designs may offer superior temperature performance at lasing frequencies of about 3.5 THz and above; however, vertical structures are more advantageous for good temperature performance at lower frequencies.


Related Articles

  • Terahertz emission from InAs induced by photo-Dember effect: Hydrodynamic analysis and Monte Carlo simulations. Reklaitis, Antanas // Journal of Applied Physics;Sep2010, Vol. 108 Issue 5, p053102 

    Terahertz emission from InAs excited by the femtosecond optical pulse is investigated. The hydrodynamic model is developed for the simplified analysis of the terahertz emission induced by the photo-Dember effect. The hydrodynamic model predicts that the amplitude of the transient photocurrent is...

  • Monte Carlo simulation of carrier transport and output characteristics of terahertz quantum cascade lasers. Li, H.; Cao, J. C.; Lü, J. T. // Journal of Applied Physics;May2008, Vol. 103 Issue 10, p103113 

    An ensemble Monte Carlo method, including electron-phonon, electron-electron, electron-impurity scatterings and the hot phonon effect, is used to simulate the carrier transport and output characteristics of a lasing terahertz quantum cascade laser. A simulated I-V curve fits well with the...

  • Monte Carlo simulation of extraction barrier width effects on terahertz quantum cascade lasers. Li, H.; Cao, J. C.; Lü, J. T.; Han, Y. J. // Applied Physics Letters;6/2/2008, Vol. 92 Issue 22, p221105 

    The effect of extraction barrier width on the performance of a resonant-phonon terahertz quantum cascade laser is studied using the ensemble Monte Carlo method. The width of extraction barrier is varied from 48 to 33 Ã… with a stepsize of -3 Ã…. The calculated threshold current density...

  • Single-pixel terahertz camera speeds measurement. Wai Lam Chan; Takhar, Dharmpal; Charan, Kriti; Kelly, Kevin F.; Baraniuk, Richard G.; Mittleman, Daniel // Laser Focus World;Sep2008, Vol. 44 Issue 9, p73 

    The article evaluates the significance of terahertz camera with one-pixel detection to the security management of companies and institution in the U.S. The technology proves to be useful in several applications including the detection of concealed weapons at airports and locating defects in...

  • Driving intervalley scattering and impact ionization in InAs with intense terahertz pulses. I-Chen Ho; Zhang, X.-C. // Applied Physics Letters;6/13/2011, Vol. 98 Issue 24, p241908 

    We report intense terahertz (THz) pulses inducing intervalley scattering and impact ionization mechanisms in doped InAs crystals by THz pump-THz probe measurements. Two competing mechanisms are observed by varying the impurity doping type of the semiconductors and the strength of the THz field....

  • Gunn oscillations in a self-switching nanodiode. Xu, K. Y.; Wang, G.; Song, A. M. // Applied Physics Letters;12/8/2008, Vol. 93 Issue 23, p233506 

    The feasibility of Gunn oscillations in a planar nanoscale unipolar diode or a self-switching device (SSD) is analyzed using Monte Carlo simulations. The asymmetric nanochannel that the SSD is based on is shown to induce charge domains much more receptively when compared to a reference symmetric...

  • Efficient terahertz generation using trap-enhanced fields in semi-insulating photoconductors by spatially broadened excitation. Kim, Dae Sin; Citrin, D. S. // Journal of Applied Physics;3/1/2007, Vol. 101 Issue 5, p053105 

    The combined effects of large trap-enhanced fields (TEFs) near the anode in semi-insulating photoconductors and enhanced terahertz emission by spatially nonuniform optical illumination are investigated using a self-consistent Poisson–Monte Carlo solver for the carrier transport. In...

  • Highly sensitive terahertz measurement of layer thickness using a two-cylinder waveguide sensor. Theuer, M.; Beigang, R.; Grischkowsky, D. // Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p071106 

    We report on the layer thickness determination on dielectrically coated metal cylinders using terahertz (THz) time-domain spectroscopy. A considerable sensitivity increase of up to a factor of 150 is obtained for layers down to 2.5 μm thickness by introducing an experimental geometry based on...

  • Field-induced soft mode hardening in SrTiO3/DyScO3 multilayers. Kužel, P.; Kadlec, C.; Kadlec, F.; Schubert, J.; Panaitov, G. // Applied Physics Letters;8/4/2008, Vol. 93 Issue 5, p052910 

    We investigate a SrTiO3/DyScO3 epitaxial multilayer with four 50-nm-thick layers of each compound deposited on DyScO3 substrate by pulsed laser deposition. The spectra of SrTiO3 obtained using time-domain terahertz spectroscopy at room temperature with and without electrical bias are explained...


Read the Article


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

Try another library?
Sign out of this library

Other Topics