Quantum cascade
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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Design Optimization for 4.1-THZ Quantum Cascade Lasers
... A challenge associated with terahertz-quantum cascade lasers (THz-QCLs) is to achieve population inversion in a THz inter-subband structure, at room temperature. Due to the small subband energy separation, ...
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High order sideband generation in terahertz quantum cascade lasers
... Quantum Cascade Lasers (QCLs) are powerful intersub- band laser sources operating throughout the mid-infrared (MIR) 1 and terahertz (THz) 2 spectral ...
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Optical feedback effects on terahertz quantum cascade lasers: modelling and applications
... [65] Grier, A., Dean, P., Valavanis, A., Keeley, J., Kundu, I., Cooper, J., Agnew, G., Taimre, T., Lim, Y. L., Bertling, K., Rakić, A. D., Li, L., Harrison, P., Linfield, E. H., Ikonić, Z., Davies, A. G., and Indjin, D., ...
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Tapered Quantum Cascade Laser Arrays Integrated with Talbot Cavities
... Power scaling in broad area quantum cascade laser (QCL) usually leads to the deterioration of the beam quality with an emission of multiple lobes far-field pattern. In this letter, we demonstrate a tapered ...
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Silver-based surface plasmon waveguide for terahertz quantum cascade lasers
... Terahertz-frequency quantum cascade lasers (THz QCLs) based on ridge waveguides incorporating silver waveguide layers have been investigated theoretically and experimentally, and compared with traditional ...
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Terahertz Nanoscopy of Plasmonic Resonances with a Quantum Cascade Laser
... This article reports the realization of a near-field scattering optical microscope (s-SNOM) operating in the terahertz frequency range based on resonant quartz tuning forks and on quantum cascade lasers. ...
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Development of Terahertz Frequency Quantum Cascade Lasers for the Applications as Local Oscillators
... A range of chemical, biological, radiological and nuclear defence (CBRN) agents and explosives exhibit vibrational and rotational transitions at THz and mid- infrared (TERA-MIR) frequencies, and this has fuelled interest ...
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Terahertz sensing and imaging using a quantum cascade laser
... The quantum cascade laser (QCL) [1] is a compact semiconductor source of terahertz (THz) frequency radiation that is potentially well-suited for imaging across a broad range of applications including ...
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n-Si/SiGe quantum cascade structures for THz emission
... THz quantum cascade lasers, Si/SiGe quantum cascade structures are attracting considerable attention as a very promising technology for the same ...
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Theoretical Investigation of Electronic and Optical Properties of Si/SiGe Quantum Cascade Structures
... Figure 6, shows the relative position of minibands for two consecutive transport zones under an applied bias for our quantum cascade structure. By varying the thickness of the wells and barriers of the ...
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Fully phase-stabilized quantum cascade laser frequency comb
... based Quantum Cascade Laser combs (QCL-combs) are ideal candidates, in this respect, due to the unique possibility to tailor their spectral emission by proper nanoscale design of the quantum ...
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Density matrix superoperator for periodic quantum systems and its application to quantum cascade laser structures
... The Density matrix (DM) formalism was first introduced by J. Von Neumann 1–4 and its applications span through a variety of fields in Quantum Mechanics. The time evolution of the density matrix is, generally, ...
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Low Power Consumption Substrate Emitting DFB Quantum Cascade Lasers
... years, quantum cascade lasers (QCLs) have undergone a rapid development and become the most promising source in the mid-infrared frequency region ...
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Line defect photonic crystal terahertz quantum cascade laser
... The terahertz (THz) quantum cascade laser (QCL) provides a versatile tool in a plethora of applications ranging from spectroscopy to astronomy and communications. In many of these fi elds, compactness, ...
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Sample Grating Distributed Feedback Quantum Cascade Laser Array
... A sample grating distributed feedback quantum cascade laser array aim at broad tunability and enhanced side mode suppression ratios is presented. Utilizing a sample grating dependence on emission wavelength ...
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Aspects of the internal physics of InGaAs/InAlAs quantum cascade lasers
... the quantum cascade structure is described within a tight-binding-like picture, where any state in the long cascade is associated with one of its ...a cascade to be constructed as replicas, ...
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A model for a pulsed terahertz quantum cascade laser under optical feedback
... Terahertz quantum cascade lasers (THz QCLs) are compact, electrically driven sources of radia- tion in the ∼ 1–5 THz band [1] that hold enormous potential for sensing [2,3] and communication applications ...
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Measuring the sampling coherence of a terahertz quantum cascade laser
... Abstract: The emission of a quantum cascade laser can be synchronized to the repetition rate of a femtosecond laser through the use of coherent injection seeding. This synchronization defines a sampling ...
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Model for a pulsed terahertz quantum cascade laser under optical feedback
... Terahertz quantum cascade lasers (THz QCLs) are compact, electrically driven sources of radia- tion in the ∼ 1–5 THz band [1] that hold enormous potential for sensing [2,3] and communication applications ...
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