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10th International Conference on Laser and Fiber-Optical Networks Modeling (LFNM2010). 2nd International Workshop on Thz Radiation: Basic Research and Applications (TERA 2010)
The results of development of multifunctional quasi-optical measuring system, designed to demonstrate the basic radio-measuring techniques in quasi-optical waveguide transmission line THz range It can be used as a training laboratory installation in high-school educational process for training of university students working on a degree in electronics and radio-physics method to the measurements in...
We accumulated here the technique for measuring the electrodynamic constitutive parameters (the effective permittivity and permeability) for some 1D (one dimensional) metamaterials formed by the natural materials. The question of transfer form the radiofrequency band up to optical frequencies is under discussion.
In this paper we investigated boundary conditions for the impedance circular cylinder covered by a low contrast dielectric thin layer. Expression for the resulted impedance of the cylinder is received. Conditions and boundaries to applicability of the used approach are defined. Effect to an impedance of a covering on the resulted impedance to the cylinder is investigated.
We report of a easy-to-use terahertz radiation source, which combines a QCL operating at 3.1 THz with a compact, low-input-power Stirling cooler. The QCL, which is based on a two-miniband design, has been developed for high output powers and low electrical pump power. The whole system weighs less than 15 kg including cooler, power supplies etc. The peak output power is 8 mW at 3.1 THz. The applicability...
THz spectroscopy was used to investigate bovine serum albumin (BSA) flexibility in conditions ranging from lyophilised BSA to dilute 10% w/w BSA solution and highly concentrated 50% w/w BSA solutions. The simulated THz spectra of dry and hydrated BSA are in good agreement with the experiments.
Terahertz-range intracenter silicon lasers have demonstrated significant progress over past decade in expanding the frequency operation range, in manipulation of a silicon matrix as well as in lowering of optical pump threshold. While terahertz gain realized in silicon lasers has been already defined, optical losses in the active media have not been yet measured experimentally. We applied continuous...
It is shown that one can control the spectrum of electromagnetic wave propagating through dielectric medium by applied external electric field. The control of field spectrum may be used for designing of the controllable filters in the terahertz and optical band for uninterrupted and pulse signals.
The generation of coherent, high power TERA-MIR radiation with compact steady state sources operating at room temperature is one of the main technological challenges of the early 21st century. In this talk, I will review the most recent results on different types of sources and than focus on predictive simulations of Quantum Cascade Lasers, which are the best candidate sources for this spectral range.
Two-dimensional model of a photoconducting emitter for the terahertz radiation excited by a femptosecond laser pulse is considered. Short-wave asymptotic formulas for electric fields of the emitter are presented. The contributions of both geometrical optics rays and effects of edges diffraction are taken into account.
Physics of plasma oscillations and basic principles of plasmonic detection of THz radiation in FET structures with 2D electron channels are discussed. Plasmonic devices are practically attractive because they are extremely fast and electrically tunable through the entire THz frequency band by changing electric potentials at metal contacts of the device.
A novel MEMS thermopile structure is presented, in which the thermopairs act as dipole antennas. The induced current heats the hot point of the thermopairs. The thermoelectric output voltage is proportional to the absorbed radiation power. The antenna-like feature of the device is demonstrated by the dependence of the sensitivity on the polarization. 5.58 V/W responsivity was achieved at 0.1 THz without...
In this work, new approach to gain spectra tuning have been developed for quantum-cascade structures. The spectral tuning is based on the phase space filling effect evoked by optical driving signals inducing interband electron transitions and populating of conduction lasing subbands. For three-well THz GaAs/AlGaAs quantum-cascade structure, mathematical modeling show that gain spectra can be shifted...
We propose fundamentally new technical and constructive solutions to the construction of the receiving and transmitting structures of the terahertz radiation based on apodized and chirped periodic lattices. It is shown that the efficiency can reach about 88% at the resonance frequency of 1.82 THz and simultaneous apodization and chirping of the structures when the number of periods of such a structure...
The application of the microwave approach to the developing of the terahertz (THz) frequency range allowed producing the set of precise methods and devices for various applications. The midpoint of the development was the using of the mixers and multipliers on the quantum semiconductor superlattices which allow more effective signal transformation in comparison with usually used devices based on Schottky...
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