Electrically tunable terahertz quantum-cascade laser with a heterogeneous active region

Khanna, Suraj P.; Salih, Mohammed; Dean, Paul; Davies, A. Giles; Linfield, Edmund H.
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p181101
Academic Journal
We demonstrate experimentally a terahertz frequency quantum-cascade laser which can be tuned electronically, in a step-wise manner from typically 3.07 to 3.40 THz, by changing the applied electric field across the device. To achieve this, the gallium growth rate was successively reduced during growth of the active region from +6% to -4% of its nominal 1 μm/h operating value. This produced a heterogeneous active region, comprising 23 sections of different lasing units stacked together. With a single-metal surface-plasmon waveguide configuration, the devices operated in pulsed mode, up to a temperature of 81 K, and gave peak powers of ∼8 mW.


Related Articles

  • Optical mode control of surface-plasmon quantum cascade lasers. Moreau, V.; Bahriz, M.; Palomo, J.; Wilson, L. R.; Krysa, A. B.; Sirtori, C.; Austin, D. A.; Cockburn, J. W.; Roberts, J. S.; Colombelli, R. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p507 

    Surface-plasmon waveguides based on metallic strips can provide a two dimensional optical confinement. This concept has been successfully applied to quantum cascade lasers, processed as ridge waveguides, to demonstrate that the lateral extension of the optical mode can be influenced solely by...

  • Optical transmission properties of perforated metal films in the middle-infrared range. Yong-Hong Ye; Yurong Cao; Zhi-Bing Wang; Desheng Yan; Jia-Yu Zhang // Applied Physics Letters;2/23/2009, Vol. 94 Issue 8, p081118 

    We experimentally studied the enhanced optical transmission of perforated silver films in the middle-infrared region. The optical transmission properties of the samples with classical inductive frequency selective surface structures are also affected by both the periodicity and the aperture...

  • Novel Dielectric-Loaded Plasmonic Waveguide for Tight-Confined Hybrid Plasmon Mode. Ma, Youqiao; Farrell, Gerald; Semenova, Yuliya; Chan, Hau; Zhang, Hongzhou; Wu, Qiang // Plasmonics;Jun2013, Vol. 8 Issue 2, p1259 

    In this paper, a novel metal-dielectric waveguide structure is proposed to support hybrid long range surface plasmon polaritons (LRSPPs) with a highly confined mode field. The simulation results showed that our proposed structure has better mode confinement and propagation length compared to...

  • Confinement of THz surface waves on the subwavelength size metal waveguide. Gacemi, Djamal; Mangeney, Juliette; Blary, Karine; Lampin, Jean-Francois; Laurent, Thibault; Akalin, Tahsin; Crozat, Paul; Meng, Fanqi // Applied Physics A: Materials Science & Processing;Dec2012, Vol. 109 Issue 4, p993 

    We investigate surface plasmon waves propagating on planar Goubau lines, so-called Goubau modes, using a guided-wave terahertz spectroscopy system based on a freely positionable electrooptic probe. We show the radial nature of the Goubau mode and its confinement around the Goubau line over a few...

  • Electrical laser frequency tuning by three terminal terahertz quantum cascade lasers. Ohtani, K.; Beck, M.; Faist, J. // Applied Physics Letters;1/6/2014, Vol. 104 Issue 1, p011107-1 

    Electrical laser emission frequency tuning of a three terminal THz quantum cascade laser is demonstrated. A high electron mobility transistor structure is used in a surface plasmon waveguide to modulate the electron density in a channel, controlling the effective refractive index of the...

  • Transmission of terahertz wave through one-dimensional photonic crystals containing single and multiple metallic defects. Liu, Hai-Ying; Liang, Sen; Dai, Qiao-Feng; Wu, Li-Jun; Lan, Sheng; Venu Gopal, Achanta; Trofimov, Vyacheslav A.; Lysak, Tatiana M. // Journal of Applied Physics;Oct2011, Vol. 110 Issue 7, p073101 

    We investigated numerically and experimentally the transmission of terahertz (THz) waves through single and multiple metallic defects created in a one-dimensional (1D) photonic crystal (PC) by inserting single metallic wires or arrays of parallel metallic wires into the air-gap defect of the 1D...

  • Surface-plasmon resonance imaging just got easier. Wallace, John // Laser Focus World;Jul2011, Vol. 47 Issue 7, p28 

    The article discusses the easy access of the surface-plasmon resonance imaging that allows researchers to map out local electric filelds in the U.S.

  • Terahertz quantum-cascade laser operating up to 137 K. Williams, Benjamin S.; Kumar, Sushil; Callebaut, Hans; Qing Hu; Reno, John L. // Applied Physics Letters;12/22/2003, Vol. 83 Issue 25, p5142 

    We report operation of a terahertz quantum-cascade laser at 3.8 THz (λ≈79 μm) up to a heat-sink temperature of 137 K. A resonant phonon depopulation design was used with a low-loss metal–metal waveguide, which provided a confinement factor of nearly unity. A threshold current...

  • Broadside excitation of surface plasmon waveguides on Cytop. Daviau, Richard; Lisicka-Skrzek, Ewa; Tait, R. Niall; Berini, Pierre // Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG 

    Long-range surface plasmon waveguides consisting of a Au stripe on Cytop, covered with an index-matched aqueous solution, are described and characterized. The waveguides are tested using a broadside coupling technique, whereby tapered single-mode fibers are positioned in direct contact with the...


Read the Article


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

Try another library?
Sign out of this library

Other Topics