Dual wavelength emission from a terahertz quantum cascade laser

Freeman, Joshua R.; Madéo, Julien; Brewer, Anthony; Dhillon, Sukhdeep; Marshall, Owen P.; Jukam, Nathan; Oustinov, Dimitri; Tignon, Jerome; Beere, Harvey E.; Ritchie, David A.
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p051120
Academic Journal
We describe a heterogeneous terahertz (THz) quantum cascade laser that is composed of two different active region designs. This device emits simultaneously at around 2.5 and 2.9 THz with certain frequency tunability by applied current. We also investigate the spectral gain in the structure by THz time-domain spectroscopy and correlate the gain spectral bandwidth with the alignment and wavelength emission behavior of the two stack device.


Related Articles

  • Fetch Limited Drag Coefficients. Vickers, Dean; Mahrt, L. // Boundary-Layer Meteorology;Oct1997, Vol. 85 Issue 1, p53 

    Measurements made at a tower located 2 km off the coast of Denmark in shallow water during the Ris� Air Sea Experiment (RASEX) are analyzed to investigate the behaviour of the drag coefficient in the coastal zone. For a given wind speed, the drag coefficient is larger during conditions of...

  • A new broadband homonuclear mixing pulse for NMR with low applied power. Coote, Paul; Leigh, Kendra E.; Tsyr-Yan Yu; Khaneja, Navin; Wagner, Gerhard; Arthanari, Haribabu // Journal of Chemical Physics;7/14/2014, Vol. 141 Issue 2, p024201-1 

    Broadband homonuclear mixing pulses with low radiofrequency power are essential for NMR spectroscopy of proteins and small molecules, especially for emerging applications in high field NMR. We have analytically designed a mixing pulse with high bandwidth-to-power ratio, using our recently...

  • Adiabatic fiber microtaper with incorporated an air-gap microcavity fiber Fabry-Pérot interferometer. Lee, Cheng-Ling; Tai, Ching-Yi; Chen, Chien-Lin; Han, Pin // Applied Physics Letters;7/15/2013, Vol. 103 Issue 3, p033515 

    This study demonstrates an adiabatic fiber microtaper with incorporated an air-gap microcavity fiber-Fabry-Pérot-interferometer to perform superior sensing characteristics. Optical interference fringes with good fringes contrast within bandwidth of 1250-1650 nm are performed experimentally. A...

  • Bond's the Game, Copper Bonds. Barthold, Jim // Telecommunications - Americas Edition;Oct2005, Vol. 39 Issue 12, p24 

    Focuses on the efforts of telecommunication companies to bond existing copper pairs to build super-fast and super-wide transportation pipes for both residential and enterprise users. Tendency for these companies to recycle old ideas in creating a new concept; Recommendation for the use of...

  • Broadcasting scheme with low client buffers and bandwidths for video-on-demand applications. Hsiang-Fu Yu; Hung-Chang Yang; Yao-Tien Wang; Ping-Lin Fan; Chu-Yi Chien // Multimedia Tools & Applications;May2009, Vol. 42 Issue 3, p295 

    Abstract��Efficient data broadcasting is independent of request arrivals, and is thus highly promising when transmitting popular videos. A conventionally adopted broadcasting method is periodic broadcasting, which divides a popular video into segments, which are then simultaneously...

  • Improving Adaptability and Per-Core Performance of Many-Core Processors Through Reconfiguration. Suri, Tameesh; Aggarwal, Aneesh // International Journal of Parallel Programming;Jun2010, Vol. 38 Issue 3/4, p203 

    Increasing the number of cores in a multi-core processor can only be achieved by reducing the resources available in each core, and hence sacrificing the per-core performance. Furthermore, having a large number of homogeneous cores may not be effective for all the applications. For instance,...

  • COPLANAR RING DIVIDER WITH WIDEBAND HIGH ISOLATION PERFORMANCE. Li, C.; Lok, L. B.; Khalid, A.; Cumming, D. R. S. // Progress in Electromagnetics Research Letters;Aug2011, Vol. 25, p1 

    In this letter, the design and measurement of a new ring power divider exhibiting wideband high isolation is presented. Coplanar techniques are used to achieve a compact and truly uniplanar design. The design is demonstrated by a prototype, operating at K-band, that has been monolithically...

  • Bandwidth efficient MT-DS-SS via reduced subcarrier frequency spacing. Indranil Sen; David Matolak // Wireless Personal Communications;Dec2007, Vol. 43 Issue 4, p1419 

    Abstract  We investigate modifications to conventional multitone direct-sequence spread spectrum (MT-DS-SS) signaling to improve spectral efficiency, for high-data-rate systems with small processing gain. Reduction in subcarrier frequency spacing to half the symbol rate improves bandwidth...

  • Effect of the contention window size on performance and fairness of the IEEE 802.11 standard. Azade Khalaj; Nasser Yazdani; Maseud Rahgozar // Wireless Personal Communications;Dec2007, Vol. 43 Issue 4, p1267 

    Abstract  IEEE 802.11 is a widely used standard for MAC and PHY layers of WLANs. Unfortunately, the access methods offered in this standard cannot support QoS (Quality of Service) for real-time traffics. Using multimedia applications over WLANs is increasing and, on the other hand, 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