terahertz quantum-cascade lasers
Surface plasmon waveguides with gradually doped or NiAl intermetallic compound buried contact for terahertz quantum cascade lasers
... Indjin, D., Ikonic, Z., Harrison, P. et al. (1 more author) (2003) Surface plasmon waveguides with gradually doped or NiAl intermetallic compound buried contact for terahertz quantum cascade ...
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Metamaterial/graphene amplitude and frequency modulators for the active control of terahertz quantum cascade lasers
... Hybrid metamaterial/graphene amplitude and frequency modulators have been implemented as external optoelectronic mirrors in external cavity configurations with terahertz quantum cascade lasers ...
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Terahertz quantum cascade lasers with thin resonant-phonon depopulation active regions and surface-plasmon waveguides
... We report three-well, resonant-phonon depopulation terahertz quantum cascade lasers with semi-insulating surface-plasmon waveguides and reduced active region (AR) thicknesses. Devices with ...
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Optical feedback effects on terahertz quantum cascade lasers: modelling and applications
... “Coupled-cavity terahertz quantum cascade lasers for single mode operation,” ...in terahertz quantum cascade lasers using coupled cavities,” ...
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Discrete Vernier tuning in terahertz quantum cascade lasers using coupled cavities
... of terahertz quantum cascade lasers is demonstrated using a device comprising a two-section coupled- ...ridge lasers, and does not lead to any corresponding change in emitted ...
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Frequency Tuning Range Control in Pulsed Terahertz Quantum Cascade Lasers: Applications in Interferometry
... Abstract— Terahertz quantum cascade-lasers (QCLs) are able to produce higher optical output power at higher temperatures when operated in pulsed ...
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Fast modulation of terahertz quantum cascade lasers using graphene loaded plasmonic antennas
... In order to test the modulation speed of the device, a more powerful, stable and narrow frequency THz source is required. A bound to continuum quantum cascade laser was used for all these measurements. The ...
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Single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers
... Another potential way to overcome the drawbacks of ridge-waveguide THz QCLs is to use concentric-circular- gratings (CCGs). 16–18 In this letter, we demonstrate single- mode surface emitting second-order CCG DFB THz ...
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Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics
... Through several devices for which we have performed this procedure, we see variation in the far-field patterns observed. The far-field can also change as the current and frequency composition of the emission changes. We ...
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Resonant−phonon depopulation terahertz quantum cascade lasers and their application in spectroscopic imaging
... In general, the affect of parasitic heating is compounded in RP structures by the large parasitic current channels [17,18] inherent in this AR design. As a result continuous-wave operation is difficult to achieve, which ...
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Fast room temperature detection of terahertz quantum cascade lasers with graphene loaded bow tie plasmonic antenna arrays
... temperature terahertz detector based on interdigitated bow-tie antennas contacting ...a terahertz quantum cascade laser emitting in single frequency around 2 THz yielding a responsivity of ~ ...
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Surface-emitting terahertz quantum cascade lasers with continuous-wave power in the tens of milliwatt range
... operate terahertz frequency quantum cas- cade lasers 1 (THz QCLs) in continuous-wave (CW) is essen- tial for many applications, including their use in local oscillator systems, 2 ...
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Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers
... Light-current-voltage (LIV) characterization was carried out at different heatsink temperatures under pulsed mode operation (200 ns pulses at 10 kHz repetition), and results are shown in Fig. 5(a). The devices operate up ...
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Frequency and amplitude modulation of ultra-compact terahertz quantum cascade lasers using an integrated avalanche diode oscillator
... the terahertz frequency range would greatly benefit from the availability of compact semiconductor-based ...pumped quantum cascade lasers (QCLs) have recently emerged as a promising solution, ...
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Continuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
... (Received 26 November 2012; accepted 11 February 2013; published online 6 March 2013) We demonstrate a coherent imaging system based on a terahertz (THz) frequency quantum cascade laser (QCL) ...
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Graphene Integrated Metamaterial Device for All Electrical Polarization Control of Terahertz Quantum Cascade Lasers
... S.J.K. acknowledges the Integrated Photonic and Electronic Systems CDT (Grant No. EP/L015455/1) for funding and support. S.J.K., N.W.A., B.W., W.M., H.E.B., D.A.R., and R.D. acknowledge fi nancial support from the ...
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Graphene Integrated Metamaterial Device for All Electrical Polarization Control of Terahertz Quantum Cascade Lasers
... beyond this point. The polarization modulation in the 2.24 THz frequency region, although presenting a reduced modulation depth because of the aforementioned lopsided lithographic mismatch, intercepts the spectral range ...
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Non-invasive absolute measurement of leaf water content using terahertz quantum cascade lasers
... In this work, we report on a method for measuring the leaf wet mass using a terahertz quantum cascade laser [28] (THz QCL) and a camera. This method is based on a linear law which relates the leaf ...
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Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers
... Abstract: We report a coherent terahertz (THz) imaging system that utilises a quantum cascade laser (QCL) operating in pulsed-mode as both the source and detector. The realisation of a short-pulsed ...
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Temperature Dependent High Speed Dynamics of Terahertz Quantum Cascade Lasers
... Although the RREs are expressed in terms of a current forcing function I(t), terminal voltage V (t) is also required by the equations for two reasons: (i) calculation of self heating within the AR, as expressed in Eq. ...
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