Results 61 to 70 of about 219,971 (340)

Principles and promise of Fabry-Perot resonators at terahertz frequencies [PDF]

, 2011
Fabry–Perot resonators have tremendous potential to enhance the sensitivity of spectroscopic systems at terahertz (THz) frequencies. Increasing sensitivity will be of benefit in compensating for the relatively low power of current high resolution ...
Blake, G. A., Braakman, R.
core   +1 more source

Scattering in THz imaging [PDF]

SPIE Proceedings, 2005
A new mathematical method, the Phase Distribution Model, is devised for the calculation of attenuation and scattering of THz radiation in random materials. The accuracy of the approximation is tested by comparison with exact calculations and with experimental measurements on textiles and specially constructed phantoms.
Fletcher, J.R., Swift, G.P., Dai, D.C., Beggs, D., Abram, R.A., Kaliteevski, M., Levitt, J., Gallant, A., Chamberlain, J.M.   +8 more
openaire   +3 more sources

Research progress of THz solid state amplifier

Dianzi Jishu Yingyong, 2019
With the development of semiconductor technology, characteristic frequency of transistors have been improving so far and into THz frequency range, which makes it possible for solid state devices to work in THz frequency range.
Guo Fangjin, Wang Weibo, Chen Zhongfei, Sun Hongzheng, Zhou Xibang, Tao Hongqi   +5 more
doaj   +1 more source

Design and Simulation of Thermo-Optic Phase Shifters With Low Thermal Crosstalk for Dense Photonic Integration

IEEE Access, 2020
We investigate and demonstrate the thermal crosstalk problem in integrated photonic circuits with metal and silicon doped heaters. Further, we illustrate that due to the localized heating effect, integrated doped heaters are out-performed in terms of ...
Souvaraj De, Ranjan Das, Ravi K. Varshney, Thomas Schneider   +3 more
doaj   +1 more source

Optical channel aggregation based on modulation format conversion by coherent spectral superposition with electro-optic modulators

APL Photonics, 2023
Spectrally efficient modulation formats become essential for optical network scaling as the demand for routed data streams exceeds the present wavelength-division multiplexing systems’ throughput.
Arijit Misra, Stefan Preußler, Karanveer Singh, Janosch Meier, Thomas Schneider   +4 more
doaj   +1 more source

Strongly birefringent cut-wire pair structure as negative index wave plates at THz frequencies

, 2009
We report a new approach for the design and fabrication of thin wave plates with high transmission in the terahertz (THz) regime. The wave plates are based on strongly birefringent cut-wire pair metamaterials that exhibit refractive indices of opposite ...
Beigang, R., Imhof, C., Paul, O., Rahm, M., Weis, P.   +4 more
core   +1 more source

Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 2.5-5 THz band. [PDF]

, 2013
A low-loss and low-dispersive optical-fiber-like hybrid HE11 mode is developed within a wide band in metallic hollow waveguides if their inner walls are coated with a thin dielectric layer. We investigate terahertz (THz) transmission losses from 0.5 to 5.
Bledt, CM, Harrington, JA, Melzer, JE, Mitrofanov, O, Navarro-Cía, M, Vitiello, MS   +5 more
core   +1 more source

All-electrical recursive generation and time-domain mode division multiplexing of Hermite–Gaussian pulses for optical, THz and RF links

Scientific Reports
Space division multiplexing (SDM) with Hermite Gaussian (HG) modes, for instance, can significantly boost the transmission link capacity. However, SDM is not suitable in existing single mode fiber networks, and in long-distance wireless, microwave, THz ...
Xiaonan Yu, Janosch Meier, Paulomi Mandal, Mohamed I. Hosni, Abhinand Venugopalan, Lingfei Wang, Thomas Schneider   +6 more
doaj   +1 more source

Terahertz Wave Guiding by Femtosecond Laser Filament in Air

, 2013
Femtosecond laser filament generates strong terahertz (THz) pulse in air. In this paper, THz pulse waveform generated by femtosecond laser filament has been experimentally investigated as a function of the length of the filament. Superluminal propagation
Cheng, Ya, Chu, Wei, Liu, Weiwei, Wang, Zhi, Xu, Zhizhan, Zeng, Bin, Zhang, Yizhu, Zhao, Jiayu   +7 more
core   +1 more source

Compressed sensing with near-field THz radiation [PDF]

, 2017
We demonstrate a form of near-field terahertz (THz) imaging that is compatible with compressed sensing algorithms. By spatially photomodulating THz pulses using a set of shaped binary optical patterns and employing a 6-μm-thick silicon wafer, we are able
Hendry, Euan, Hobson, Peter, Hornett, Samuel M., Padgett, Miles, Phillips, David B., Stantchev, Rayko I.   +5 more
core   +1 more source