Journal of Infrared, Millimeter, and Terahertz Waves

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Study of the Polarization Strategy for Electron Cyclotron Heating Systems on HL-2M
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 37 - Trang 572-581 - 2016
F. Zhang, M. Huang, D. H. Xia, S. D. Song, J. Q. Wang, B. Huang, H. Wang
As important components integrated in transmission lines of electron cyclotron heating systems, polarizers are mainly used to obtain the desired polarization for highly efficient coupling between electron cyclotron waves and plasma. The polarization strategy for 105-GHz electron cyclotron heating systems of HL-2M tokamak is studied in this paper. Considering the polarizers need high efficiency, st...... hiện toàn bộ
A Novel Geometry Multi-Stage Depressed Collector for the Efficiency Enhancement of Space Traveling Wave Tubes
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 34 - Trang 53-61 - 2012
A. Mercy Latha, Vishant Gahlaut, Jaspreet Kaur, Dheeraj Bharti, V Srivastava, R K Sharma, S. K. Ghosh
A novel geometry of a multi-stage depressed collector with four stages has been designed for Ka-band space traveling wave tube. The inner structure of each electrode of the collector has been provided with a single-step corrugation of a positive slope followed by a negative slope. The performed simulation predicts that the proposed collector has 7 % more efficiency, less back streaming of electron...... hiện toàn bộ
Terahertz Conductivity Analysis for Highly Doped Thin-Film Semiconductors
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 41 Số 12 - Trang 1431-1449 - 2020
Aleksander M. Ulatowski, Laura M. Herz, Michael B. Johnston
AbstractThe analysis of terahertz transmission through semiconducting thin films has proven to be an excellent tool for investigating optoelectronic properties of novel materials. Terahertz time-domain spectroscopy (THz-TDS) can provide information about phonon modes of the crystal, as well as the electrical conductivity of the sample. When paired with photoexcitat...... hiện toàn bộ
Parametric Simulation and Optimization of Cold-test Properties for a 220 GHz Broadband Folded Waveguide Traveling-wave Tube
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 30 Số 9 - Trang 945-958 - 2009
Ruilin Zheng, Xuyuan Chen
Eigenmodes of Regular Polygonal Waveguides
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 32 - Trang 40-46 - 2010
Vyacheslav V. Komarov
Eigenvalues and eigenfields of regular polygonal waveguides are analyzed numerically. The lowest and high-order TE- and TM-modes are identified on a basis of united classification scheme. Closed-form expressions for calculation of cutoff wavelengths of the lowest TE- and TM-modes are presented.
THz Time-Domain Spectroscopic Imaging of Human Articular Cartilage
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 33 - Trang 593-598 - 2012
Euna Jung, Hongkyu Park, Kiwon Moon, Meehyun Lim, Youngwoong Do, Haewook Han, Hyuck Jae Choi, Byung-Hyun Min, Sangin Kim, Ikmo Park, Hanjo Lim
Terahertz Nondestructive Stratigraphic Analysis of Complex Layered Structures: Reconstruction Techniques
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 42 - Trang 929-946 - 2021
Min Zhai, D. S. Citrin, Alexandre Locquet
Terahertz (THz) time-of-flight tomography (TOFT), a nondestructive-evaluation technique for the stratigraphic characterization of structures with layers on the micron-to-millimeter scales, has proven to be challenging to apply to samples containing both micron-scale and millimeter-scale layers. In THz TOFT, echoes reflected from distant interfaces and defects are often obscured as they may be imme...... hiện toàn bộ
Terahertz Measurements on Subwavelength-Size Samples Down to the Tunneling Limit
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 43 - Trang 314-334 - 2022
D. Maluski, I. Cámara Mayorga, J. Hemberger, M. Grüninger
For terahertz spectroscopy on single crystals, the wavelength $$\lambda$$ often is comparable to the size of the studied samples, emphasizing diffraction effects. Using a continuous-wave terahertz spectrometer in transmission geometry, we address the effect of the sample size on the achievable acc...... hiện toàn bộ
Q-Band Millimeter Wave Imaging in the Far-Field Enabled by Optical Upconversion Methodology
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 33 - Trang 54-66 - 2011
Jesse P. Samluk, Christopher A. Schuetz, Thomas Dillon, E. Lee Stein, Andrew Robbins, Daniel G. Mackrides, Richard D. Martin, John Wilson, Caihua Chen, Dennis W. Prather
Millimeter-wave (mmW) imaging has evolved to the point where it offers distinctive remote sensing capabilities in many application scenarios, such as port and harbor security, search and rescue, and navigational aids, due to its unique ability to penetrate atmospheric obscurants. Some of the applications being considered require passive imaging, imposing challenging sensitivity requirements to det...... hiện toàn bộ
Mid-infrared Frequency Comb Spanning an Octave Based on an Er Fiber Laser and Difference-Frequency Generation
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 33 - Trang 479-484 - 2012
Fritz Keilmann, Sergiu Amarie
We describe a coherent mid-infrared continuum source with 700 cm-1 usable bandwidth, readily tuned within 600–2500 cm-1 (4–17 μm) and thus covering much of the infrared "fingerprint" molecular vibration region. It is based on nonlinear frequency conversion in GaSe using a compact commercial 100-fs-pulsed Er fiber laser system providing two amplified near-infrared beams, one of them broadened by a ...... hiện toàn bộ
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