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Showing 1 to 20 of 50 for “"Photonic Band Gap"”.
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On-chip silicon based photonic structures : photonic band gap and quasi-photonic band gap materials
This thesis focuses on integrated silicon based photonic structures, photonic band gap (PBG) and quasi-photonic band gap (QPX) structures, which are based on high refractive index contrast dielectric layers and CMOS compatibility. We developed a new type of silicon waveguide - Photonic Crystal (PC) …
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Exploring for new photonic band gap structures
In the infinite set of possible photonic band gap structures there are no simple rules to serve as a guide in the search for optimal designs. The existence and characteristics of photonic band gaps depend on such factors as dielectric contrast, volume fraction, symmetry and connectivity of the …
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Experimental study of photonic band gap accelerator structures
… research on a novel accelerator concept using a photonic bandgap (PBG) structure. Major advances in higher order mode (HOM) damping are required for the next generation of TeV linear colliders. In this work, PBG HOMs are studied theoretically and experimentally for the first time. PBG HOMs are …
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Electromagnetic field computation and photonic band gap devices
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Novel photonic band gap structures for accelerator applications
… and experimental demonstration of the first photonic band gap (PBG) accelerator at 17.140 GHz. A photonic band gap structure is a one-, two- or three-dimensional periodic metallic and/or dielectric system (for example, of rods), which acts like a filter, reflecting rf fields in some frequency …
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A 250 GHz photonic band gap gyrotron amplifier
… a 8.9 T magnetic field. The instantaneous -3 dB bandwidth of the amplifier at peak gain is 0.4 GHz. A peak output power of 45 W has been measured. The output power is not saturated but is limited by the 7.5 mW of available input power. The amplifier can be tuned for operation from 245- 256 GHz. …
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The fabrication of 3-D photonic band gap structures
Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Synthesis of electromagnetic modes in photonic band gap fibers
… modes, HE11, TEo0, and TE02 for transmission in photonic band gap fibers at near infrared wavelengths. We measure the propagation losses of the HE11 and TE01 modes both inside and outside the band gap of the fiber, and show that the TE01 is indeed the lowest loss mode, and is less lossy and has a …
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Experimental studies of hybrid photonic band gap accelerator structures
… reports the first high power tests of a hybrid photonic band gap (PBG) accelerator structure. PBG structures can support a single electromagnetic mode, thus damping higher-order modes (HOMs) generated by wakefields. We have designed, built and successfully tested a 17.14 GHz hybrid PBG (HPBG) …
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Photonic band gap structures for superconducting radio-frequency particle accelerators
… superconducting accelerating cavity with a photonic band gap (PBG) coupler cell. The structure serves as a building block for superconducting radio-frequency (SRF) electron accelerators. It has five accelerating cells: four cells of elliptical shape, commonly used for SRF cavities, and one …
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Tunable micro-cavities in photonic band-gap yarns and optical fibers
… fibers derive from their multilayer dielectric photonic band-gap structure that exhibits omnidirectional reflectivity. The theoretical tools needed to design, analyze and optimize such structures are introduced. We show that defect layers in these otherwise periodic structures act as optical …
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Fabrication of ceramic layer-by-layer infrared wavelength photonic band gap crystals
<p>Photonic band gap (PBG) crystals, also known as photonic crystals, are periodic dielectric structures which form a photonic band gap that prohibit the propagation of electromagnetic (EM) waves of certain frequencies at any incident angles. Photonic crystals have several potential applications …
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AB initio theoretical studies of transition-metal, molecular, and photonic band-gap materials
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1992.
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Cylindrical photonic crystals
… thesis, we explore the properties of cylindrical photonic crystal waveguides in which light is confined laterally by the band gap of a cylindrically-layered photonic crystal. We show in particular that axially-uniform photonic band gap waveguides can exhibit novel behavior not encountered in their …
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High speed optical communication systems: From modulation formats to radically new fibres
High volumes of data traffic along with bandwidth hungry applications, such as cloud computing and video on demand, is driving the core optical communication links closer and closer to their maximum capacity. The research community has clearly identifying the coming approach of the nonlinear …
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Design and measurements of novel electromagnetic properties in spiral transmission fibers
One dimensional photonic band gap fibers have proven to be fascinating and versatile devices, as demonstrated by many applications. The ability to control and design these fibers to achieve specific functionalities will enable us to advance the research done with these fibers and to gain new …
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2D and 3D periodic templates through holographic interference lithography : photonic and phononic crystals and biomimetic microlens arrays
… of opportunities including such diverse areas as photonic crystals, phononic crystals, drug delivery, microtrusses, tissue scaffolds, microfluidics and colloidal crystallization. A correlation between structure and photonic band gap properties was established by systematically exploring the 11 FCC …
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Strain-tuning of periodic optical devices : tunable gratings and photonic crystals
… semiconductor micro- and nano-lasers, and photonic crystals, among many. Broadly defined with the field of microphotonics and microelectromechanical systems, these innovations have targeted applications in integrated photonic chips and optical telecommunications. To further advance the …
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Fabrication of Novel Three-Dimensional Photonic Crystals Using Multi-Beam Interference Lithography
… with diamond symmetry and a large complete photonic band gap. Band gap studies on structures that possess both high band gap and high contrast are performed. The optical setup for a diamond structure utilizing two right-angled prisms is discussed and promising experimental results are …
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Loading rubidium atoms into a hollow core fiber
… transferring rubidium atoms into a hollow core photonic band gap fiber. The atoms are first collected in a magneto-optical trap (MOT) and then cooled using polarization gradient cooling. Magnetic traps are then used to confine and transfer the atoms toward the face of the fiber. An optical …
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