Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 116 for “"Subwavelength"”.
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Periodic subwavelength photonic structures
Three applications of the interaction of light with periodic dielectric structures are investigated. The first application is large-area spectroscopy, for which we use the mid-field diffraction pattern generated by the light source passing through a transmission grating to determine its spectral …
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Designing subwavelength-structured light sources
… with feedback structures having features at the subwavelength-scale. The thesis begins by describing the interaction of light with an arbitrary complex material system, and implementing them into the electromagnetic model using two different theoretical techniques suitable for analyzing …
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Graphene Based Metamaterials For Terahertz Cloaking And Subwavelength Imaging
… enables the enhancement of the near field for subwavelength imaging at terahertz (THz) frequencies. The analysis is based on the nonlocal homogenization model for WM with the additional boundary condition in the connection of wires to graphene. The principle of the operation of the proposed …
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Subwavelength antireflection and polarization grating elements: Analysis and fabrication
… resistant compared to resist gratings. Subwavelength elements may play a critical role in high power laser systems where damage resistant antireflection and birefringent materials may not exist. By gaining an understanding and being able to control the many variables involved in the …
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Subwavelength nanostructures for optical biosensing and rapid photochemical reactions
… metal nanoparticle systems. We demonstrate a Si subwavelength nanostructure-based photochemical device. We show rapid photocatalytic structure transformation of noble metal nanoparticle ionization and reduction within 5 minutes with only pure water and room light illumination. Second, 3D …
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Engineering the optical properties of subwavelength devices and materials
… but on the other hand, has an absorber that is subwavelength in its thickness (A/390). For both cases, it is simply not enough to look for alternative materials with the desired optical properties, because the materials may not exist in nature. In fact, it has become necessary to engineer the …
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High Extinction Ratio Subwavelength 1D Infrared Polarizer by Nanoimprint Lithography
… In this research, stacked 1-dimensional (1-D) subwavelength grating structures were studied to develop compact size IR polarimetric detector by using surface plasmonic polariton. Experimental parameters were optimized by Finite Difference Time Domain (FDTD) simulation. Effects of gold (Au) …
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The Study of Ultrasonic Pulse -Echo Subwavelength Defect Detection Mechanism
… on-line package inspection implementation. The subwavelength defect detection mechanism study prompts our understanding about nondestructive characterization and evaluation of materials.
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An experimental study of light-material interaction at subwavelength scale
… new opportunities for manipulating light at the subwavelength scale. This dissertation investigates the effects of electromagnetic field confinement on light-material interaction inside nanoscale metal-dielectric composite structures. One of the simplest structures is a subwavelength hole …
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Design and transformation of three dimensional pupils : diffractive and subwavelength
… pupils are investigated in both diffractive and subwavelength regimes and in various applications to shape the flow of light. In diffractive regime, volume holograms are good candidates for pupils of optical imaging systems thanks to their three--dimensional structure, which provides richer …
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Probing ultra-subwavelength inhomogeneities embedded within dielectric targets using photonic nanojets
The use of optics to detect ultra-subwavelength features embedded within structures is a hot topic for a broad diversity of applications like spectroscopy, nanotechnology, microscopy, and optical data storage discs. Conventional objective lens based optical systems have a fundamental limit on the …
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Circular Bessel field statistics and the pursuit of far-subwavelength resolution
… far-field measurement data that results in far-subwavelength image information is proposed. Simulations show that this approach, with generous detector noise, will lead to the ability to distinguish image features on the nanometer scale with visible light. Along different lines, a perfect …
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