dual-frequency terahertz radiation
Infinite-period density-matrix model for terahertz-frequency quantum cascade lasers
... Faist, “A density matrix model of transport and radiation in quantum cascade lasers,” New J.. Harrison, “Coherent transport description of the dual-wavelength ambipolar terahertz quantum[r] ...
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Dual-frequency terahertz emission from splitting filaments induced by lens tilting in air
... for terahertz generation [20-22]. The frequency of terahertz radiation from an air-filament corresponds to the local plasma frequency, ...i.e., terahertz frequency is in ...
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Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings
... THz radiation is emitted along the surface of a cone with the axis oriented along h ¼ 0 (a ¼ 90 ) with divergences of 50 (sample D) and 70 (sample E) corresponding to a m ¼ 65 and a m ¼ 55 ...
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Enhancing Terahertz Radiation from Dipole Photoconductive Antenna by Blending Tips
... The THz emission amplitude is believed to be proportional to the local bias electric field in the optical illuminated region [14], whereas the breakdown field of the material limits the maximum applied bias field [15]. ...
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Conduction properties of thin films from a water soluble carbon nanotube/hemicellulose complex
... The macroscopic electrodes (case 1) were fabricated by depositing gold (Au), using an e-beam evaporator through a mechanical mask in an ultra-high vacuum (UHV) chamber, while the microelectrodes (case 1,2) were ...
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Frequency-tunable continuous-wave random lasers at terahertz frequencies
... algorithm implements the constraint of a minimum edge-to-edge distance of 2 µm between each pair of holes to avoid overlap between the scatterers. An increasing number, N, of holes in a patterned surface of average side ...
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Tunable circularly polarized terahertz radiation from magnetized gas plasma
... THz radiation sources from gas [8–18] or solid [19, 20] plasmas irradiated by fs intense laser pulses thanks to their high radiation strength and bandwidth up to 100 ...THz radiation of multi-MV/cm ...
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Design and Simulation Based Studies of a Dual-Band Circularly-Polarized Square Microstrip Antenna
... Abstract—A dual-band circularly-polarized microstrip antenna is proposed, and the antenna for GPS is ...The radiation characteristics of the dual-band circular polarization are achieved by installing ...
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Spectral interference of terahertz pulses from two laser filaments in air
... pulses increases from 1.33 ps to 10.66 ps, the terahertz spectral width drops from 0.7 THz to 0.1 THz, accordingly. This measurement indicates that the periodic peaks become narrower with the increase of time ...
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Design and Analysis of Double U Slot Loaded Dual Frequency Microstrip Antenna
... a dual frequency microstrip antenna for small frequency ratio ...the dual design frequencies/frequency ratio by varying the above design ...The dual design frequencies are ...
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A Symmetrical Dual-Band Terahertz Metamaterial with Cruciform and Square Loops
... In this paper, we present a THz MM with dual-band operation based on a novel sub-wavelength structure. It is found that negative permittivity in 378–500 GHz and 626–677 GHz bands can be obtained. Due to the ...
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A New Method for Simulating Power Flow Density Focused by a Silicon Lens Antenna Irradiated with Linearly Polarized THz Wave
... Figure 7 (a) and (b) show transmittance on the x-axis (y=0) and y-axis (x=0), respectively, as the linearly polarized THz wave radiation passes through the hemisphere boundary of the Si-lens antenna. Figure 7 (a) ...
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Comparison of Single Feed Single Frequency & Single Feed Dual Frequency Compact Rectangular Microstrip Patch Antenna Using IE3D Software
... ABSTRACT: This paper describes the comparison of single frequency and dual frequency compact rectangular microstrip patch antenna. In this paper rectangular patch with probe feed technique is used. ...
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Dual Band David Fractal Microstrip Patch Antenna for GSM and WiMAX Applications
... Recently fractal techniques have been widely applied to antenna design to reduce the antenna size and to achieve multi-band behavior. Fractal antennas can be physically small but have electrically long lengths in small ...
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Reduction of Cell Phone Electromagnetic Radiation Effect on Human Body
... in frequency from Extremely Low Frequency and Very Low Frequency (ELF/VLF), Radio Frequency (RF) and Microwaves, to Infrared (IR) light, Visible Light, Ultraviolet (UV) light, X-rays, and ...
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A Dual-Band Terahertz Metamaterial Based on a Hybrid 'h '-Shaped Cell
... a terahertz metamaterial with unnaturally refractive index in 2011 ...narrow frequency band, becom- ing a major hurdle to realize the possible multi-band THz functional devices such as modulators, ...
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Graphene-Based THz Tunable Bandstop Filter with Constant Absolute Bandwidth
... tunable terahertz frequency band, 2) bandstop response for rejecting undesired signals, 3) constant absolute bandwidth, and 4) simple circuit model without any extra lossy devices and slotted ground ...
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Characteristic of human arm frequency radiation
... own radiation which the field radiates into space around on the ...this radiation field can be described as the vibration of electromagnetic (EM) field generated by the human ...of frequency. This ...
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Frequency of Hawking Radiation of Black Holes
... In quantum physics, the empty space is not empty at all. In it there are always particles flashing into existence and disappear again. They always come in pairs; one particle and one anti-particle, like an electron and a ...
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Improving the Out-Coupling of a Metal-Metal Terahertz Frequency Quantum Cascade Laser Through Integration of a Hybrid Mode Section into the Waveguide
... THz radiation is strongly diffracted from what is essentially a sub-wavelength slit at the facet, which makes it difficult to collect and collimate the THz beam ...
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