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Showing 1 to 20 of 53 for “"resonant cavity"”.
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Resonant cavity Fibre Bragg grating sensor interrogation
… grating (FBG) optical sensors, known as the resonant cavity architecture. A background theory of FBG optical sensing includes several techniques for multiplexing sensors. The limitations of current wavelength-division-multiplexing (WDM) schemes are contrasted against the technological and …
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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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Resonant Cavity Studies of a Wide Range Tunable Klystron
Made available in DSpace on 2014-12-04T21:02:27Z (GMT). No. of bitstreams: 1 0001551.pdf: 10984137 bytes, checksum: 4930bbd00c3219734918ae3c9aab607b (MD5) Previous issue date: 1949
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Fabrication and characterization of resonant cavity light-emitting transistors
… the emission intensity and spectral purity, resonant cavity is introduced into the LET structure. Resonant cavity light-emitting transistors (RCLETs) have demonstrated up to 68% enhancement in the peak emission intensity and narrower emission peak compared with conventional LETs. The work …
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An Investigation of Dual-Band Fabry-Pérot Resonant Cavity Antennas
… examine a dual-band version of the Fabry-Pérot resonant cavity antenna that uses a frequency selective surface (FSS) patch layer over a ground plane to form a composite artificial ground plane that replaces the single metal ground plane of the conventional structure. The structure thus consists …
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Investigation of resonant cavity-enhanced photodetectors and avalanche optoelectronic switches
… by modern crystal growth techniques. And optical resonant cavity formed by multilayer dielectric stacks is among the important applications of heterostructures in optoelectronic devices.
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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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Studying Interactions of Gas Molecules with Nanomaterials Loaded in a Microwave Resonant Cavity
A resonant cavity operating in TE011 mode was used to study the adsorption response of single walled carbon nanotubes (SWCNTs) and other nanomaterials for different types of gas molecules. The range of the frequency signal as a probe was chosen as geometry dependent range between 9.1 -9.8 GHz. A …
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Experimental Verification for Microwave Processing of Materials in a Single Mode Rectangular Resonant Cavity
The benefits of applying microwave energy to material processing techniques have been well documented and studied. The potential benefits over conventional oven heating include faster processing times, more uniform heating, more consistent product quality, and the possibility of precise control. …
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An improved finite-element model for simulating microwave processing of polymers and polymer-composites in a cylindrical resonant cavity
… and polymer-matrix composites in a cylindrical resonant cavity was improved. The model consists of two submodels: the electromagnetic submodel and the heat transfer submodel. These two models are coupled together by the heat generation term arising due to the microwave energy. A single …
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A Coupled Heat Transfer and Electromagnetic Model for Simulating Microwave Heating of Thin Dielectric Materials in a Resonant Cavity
… simulation for heating dielectric materials in a resonant microwave cavity. The numerical simulation is validated by comparison to several independent sets of experimental data. The ultimate goal is to provide a research tool that will facilitate the industrial microwave applicator design process. …
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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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Low loss microwave power combiners/dividers
… heat dissipation is to be achieved. Cylindrical resonant cavity structures give very high combining efficiencies, however, they are non planar and have narrow bandwidths. N-way planar combiners/dividers fabricated on microstrip provide the desired planar structure but due to the characteristics …
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Tunnel Contact Junction Aluminum Gallium Arsenide-Gallium Arsenide-Indium Gallium Arsenide Quantum-Well Heterostructure Lasers and Light Emitters With Native-Oxide-Defined Lateral Currents
… including edge-emitting lasers, vertical cavity surface emitting lasers, and resonant cavity light emitting diodes. These devices display improved electrical characteristics and provide a means to create thin highly defined cavities in semiconductor light-emitting structures.
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The Acoustic Expander: A New Expansion Machine for Use in Cryogenic Refrigeration
… of passive reed-valves that are coupled to a resonant cavity, much like a wind instrument. The working fluid enters and exits the resonant cavity through the oscillating reed-valves which drives a standing acoustic wave in the resonant cavity. The acoustic wave carries mechanical energy from …
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Periodic subwavelength photonic structures
… back-scattering off of a photonic crystal resonant cavity. The challenge is that we want to observe high quality factor resonant peaks while reducing the size of the crystal to less than 10 microns. So far the highest quality factor observed was about 800. The third application is a Fano …
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An improved RF cavity search for halo axions
… and cold dark matter candidate. In this RF cavity experiment, halo axions entering a resonant cavity immersed in a static magnetic field convert into microwave photons, with the resulting photons detected by a low-noise receiver. I present new limits on the axion-to-photon coupling and local …
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Sol-gel synthesis of one-dimensional photonic bandgap structures
… and 110 nm in TM-polarization. A microcavity, or narrowband filter, was fabricated with a TiO2 Fabry-Perot cavity sandwiched between two mirrors of three layer pairs each. The resonant cavity corresponded to a wavelength of roughly 1500 nm and shifted to shorter wavelengths with …
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Optimization of microwave devices
… ridge waveguide (in different configurations), a resonant cavity, a waveguide impedance transformer and an electromagnetic band gap structure. Both the approaches result to be effective for the purpose even in the event that a constraint between conficting requirements is requested.
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Gallium Nitride phononic crystal resonator
… structure to relax energy confinement in the non-resonant dimension and to enable routing access of piezoelectric transducers inside the resonant cavity. This provides a clean spectrum over a wide frequency range and improves series resistance relative to transmission line or tethered resonators …
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