[PDF] Top 20 The MBE growth and optimization of high performance terahertz frequency quantum cascade lasers

... The growth of THz QCLs does, however, remain extremely challenging, owing to the stringent demands for precise control of individual layer thicknesses and alloy compositions, which must be maintained over the, ... See full document

... the growth process by optical microscope in order to compare surface ...of growth-related morphological microdefects versus growth ...of growth-conditions-dependent microdefects and the ... See full document

... Observation of modulated THz emission. Interaction between the microwave and the THz fields is taking place in the device when the two emission regimes coexist. Figure 6(a,b) show the typical resulting THz emission ... See full document

... (THz) frequency quantum cascade lasers (QCLs) have undergone rapid development in performance since their first demonstration, 1 finding potential applica- tion in a number of fields ... See full document

... Abstract— Terahertz quantum cascade-lasers (QCLs) are able to produce higher optical output power at higher temperatures when operated in pulsed ...achieve performance requirements is, ... See full document

... for terahertz (THz) frequency QCLs since the growth of suitably thick dielectric waveguides is ...the performance of THz QCLs at high operating temperatures, and this is desirable for ... See full document

... of terahertz frequency quantum cascade la- sers for applications as local ...at high temperatures, with high output power and low dissipated ...power. Quantum ... See full document

... Terahertz-frequency quantum cascade lasers (THz QCLs) have undergone steady development since their first demonstration in 2002 ...emission frequency has covered the range from ... See full document

... overall performance was observed at a frequency of ...optimum performance was achieved for cavity lengths L ~ ...lower frequency limit for achieving lasing in this AR design is likely to be ... See full document

... and frequency-domain information in a single mea- ...highest performance THz QCLs, in terms of temperature and threshold current, that are obtained with a metal-metal (MM) ...and high mode index also ... See full document

... surface-emitting terahertz frequency quantum cascade lasers utilising non-uniform second-order distributed feedback ...ridge-waveguide lasers of similar size, whilst maintaining ... See full document

... this frequency was calculated to be in the range 25 − 40 dB, and is higher than those reported from devices based on multiplicative Vernier selection, such as end- fi re coupled ...the frequency tuning in ... See full document

... To study the full CC device, we exploited an effective index, 1-D transfer matrix analysis described in detail in Ref. 17. The effective index in the waveguide sections was com- puted with COMSOL-Multiphysics, using the ... See full document

... As for many systems reported to date, the early demonstrations of imaging using THz QCL sources [44–46] adopted incoherent thermal detection, thereby foregoing the advantages of coherent detection offered by TPI ... See full document

... doping. This asymmetric doping creates an electric field profile across the device, as previously described for graphene-based photodetectors operating at optical communications frequencies [5]. The detector was ... See full document

... thermally-induced frequency change can be seen in this trace, with spacing that increases as the temperature and hence frequency change diminishes with ... See full document

... the frequency linewidth due to scattering decreases ...the frequency linewidth due to scattering becomes narrower; the required population inversion, required for the threshold gain, becomes ... See full document

... 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 ... See full document

... In this letter, we report the planar integration of tapered THz QCLs with metasurface structures, which are processed into SSP out-couplers by introducing periodically arranged scatterers. The resulting surface-emitting ... See full document

... Abstract: We explain the origin of voltage variations due to self-mixing in a terahertz (THz) frequency quantum cascade laser (QCL) using an extended density matrix (DM) approach. Our DM model ... See full document