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Showing 1 to 16 of 16 for “"Resonant cavities"”.
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Ore sorting using microwave resonant cavities
Bibliography: leaves 71-73.
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Design and performance of resonant cavities for communication systems. The theory and performance of resonant cavities for application-, in mobile radio and base-stations in the VHF and UHF bands are investigated.
… important factors are the Q, insertion loss and resonant frequency. However, a problem which frequently arises with cavity resonators is the accurate determination of these resonant characteristics complicated by the presence of coupling port, materials and various design and geometrical …
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Resonant Cavity Enhanced Photodetectors and Optoelectronic Switches
… devices integrated into Fabry-Perot resonant cavities. The photosensitivity of conventional detectors is governed by the optical properties of the semiconductor material requiring thick absorption regions for high quantum efficiencies. It is desirable to enhance the quantum efficiency …
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Fundamental limits to local density of states in absorptive system
… in the metallic cavity structures, as typical resonant cavities will produce high LDOS. A novel shape optimization method based on the adjoint method is presented in this work, several numerical methods (BEM, CGAL, etc.) and optimization methods are implemented to enable more efficient …
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Dipole photonic resonators and analogs of matter
High power RF deflecting cavities have found a wide range of applications which include particle separation, emittance exchange, X-ray pulse compression, temporal beam diagnostics, and crab crossing in colliders. However, conventional deflecting cavities suffer from beam degrading parasitic modes …
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Resonant-cavity-enhanced multispectral infrared photodetectors for monolithic integration on silicon
… development of novel IR sensitive material and resonant-cavity- enhanced (RCE) photodetector devices that address the emerging need in the field of IR radiation detection. Polycrystalline PbTe films have been identified as the IR absorbing layers due to their high photosensitivity and …
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A coupled electromagnetic and heat transfer finite-element model for simulating microwave processing of composite materials in a cylindrical resonant cavity
… of composite materials in a cylindrical resonant cavity was developed. The two-dimensional model simulates processing of axisymmetric material loads in cylindrical resonant cavities operating in the TM₀₁₀ mode. The model consists of an electromagnetic model and a heat transfer model which …
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Optical Characterisation of Astronomical Submillimetre Receivers including ALMA Bands 5 and 9
… response patterns of several standing wave cavities were predicted with this technique and compared with experimental measurements. The effect of minor alterations to the feed horn structures on the resonance profiles are studied in depth. The eigenmodes of these resonant cavities are also …
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Evaluation of the Aerodynamic and Acoustic Performance of a Novel Passive Bat Deterrent for Wind Energy Applications
… novel passive bat deterrent design that utilizes resonant cavities exposed to airflow over the surface of an airfoil to generate noise. Two wind tunnel experiments were conducted across a range of flow speeds and angles of attack. The first investigated larger cavities designed to generate …
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Infrared photoconductive PbTe film processing and oxygen sensitization
… semiconductor films. When embedded within resonant cavities, these films are additionally capable of precise detection at narrow, selectable bands and enable the development of monolithically-integrated detectors that are physically small, highly responsive and able to record data …
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Shock Wave Dispersion in Weakly Ionized Gas
… discharge in two straight, circular cylindrical resonant cavities in TE<sub>1,1,1</sub> and TM<sub>0,1,2</sub> modes were introduced to perform additional experimental studies on shock wave modification in non-equilibrium weakly ionized gases and to clarify the physical mechanisms of the shock …
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Planar groove gap waveguides
… PGGWG by presenting electrically tunable PGGWG resonant cavities. It is found that a simple biasing network can be applied to the cavity using a varactor diode to vary the resonant frequency of the cavity. This is done without bridging wire and concentric etched rings as a direct result of the …
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Simulation of fluid suspended particle behaviour subject to transverse standing acoustic fields
… oscillatory pressure gradients within resonant cavities, which are responsible for acoustic forces, which act on particles, located within the acoustic field. These forces drive particles to nodal (no fluctuation) or anti-nodal (continuous fluctuation) planes of pressure. Standing wave …
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Chip-scale Photonic Devices for Light-matter Interactions and Quantum Information Processing
… devices such as microdisks, photonic crystal cavities and slow-light photonic crystal waveguides possess strong light localization and long photon lifetime, which will significantly enhance the light-matter interactions and can be used to implement new functionalities for both classical and …
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On-chip spectrometers with photonic integrated circuits
… power consumption. This scheme is based on multi-resonant cavities with partially reflective mirrors. As a proof-of-concept, a single-shot, dual-band RS is demonstrated, achieving a total bandwidth of 270 nm and a resolution of 0.5 nm with only 15 sampling channels per band. Lastly, this thesis …
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Auslegung von Mikrowellen-Thermoprozess-Anlagen unter Nutzung von hochfrequenz-technischen Prinzipien
Um der Mikrowellenerwärmung als Single- oder Hybridanwendung im industriellen Ofenbau ein weiteres Anwendungsspektrum zu eröffnen, wird dem Anlagenkonstrukteur im Rahmen dieser Arbeit eine Aufstellung von Entwicklungsprioritäten und Konstruktionshinweisen übergeben. Für eine energieeffiziente …