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4 results on '"CHANNEL WAVE-GUIDES"'

1. Light propagation in optical waveguides: A dynamic programming approach

Author

Lakshminarayanan, Vasudevan, Calvo Padilla, María Luisa, Lakshminarayanan, Vasudevan, and Calvo Padilla, María Luisa

Abstract

© 1997 Optical Society of America. The Optical Society (OSA) Annual Meeting (1995. Portland, Oregón, EE.UU.). Congress of the International Comission for Optics (ICO) (17º. 1996. Taejon, Corea del Sur). This work was supported in part by the School of Optometry of the University of Missouri–St. Louis (UMSL). A UMSL research grant is also gratefully acknowledged. We also thank Jerry Christensen, Dean, School of Optometry, USML, for support during the initial stages of this research program. Additional financial assistance from the Spanish Ministry of Education and Science (DGICYT) under project PR94-362 to M. L. Calvo is also acknowledged. Partial results were presented at the OSA Annual Meeting (Portland, Oregon, October 1995) and at the ICO-XVII Congress (Taejon, Korea, August 1996). The authors also thank an anonymous referee for a careful review and R. F. Álvarez-Estrada and G. F. Calvo for helpful suggestions and discussions., We apply techniques of optimal-control theory, namely, the methods of dynamic programming, to the problem of light propagation in optical waveguides. This formulation is equivalent to the resolution of an eikonal equation. We illustrate this optimization technique for the case of an ideal parabolic refractive-index-profile distribution. We discuss the possibility of extending this procedure to other types of optical waveguides and optical media., School of Optometry of the University of Missouri–St. Louis (UMSL), EE. UU., Subdirección General de Proyectos (DGICYT), España, Ministerio de Educación y Ciencia (MEC), España, Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

Published
2023

2. Complex refractive index variation in proton-damaged diamond

Author

Stefano Lagomarsino, D. Gatto Monticone, Lorenzo Giuntini, Paolo Olivero, Anna Sytchkova, M. Vannoni, Silvio Sciortino, S. Calusi, Mirko Massi, and Andrea Sordini

Subjects
Materials science, Light, FOS: Physical sciences, Interferometric microscopy, engineering.material, law.invention, Optics, law, Scattering, Radiation, Computer Simulation, Condensed Matter - Materials Science, Ion beam analysis, SET-UP, business.industry, Materials Science (cond-mat.mtrl-sci), Diamond, Laser, VOLUME EXPANSION, Atomic and Molecular Physics, and Optics, CHANNEL WAVE-GUIDES, ION-IMPLANTED DIAMOND, Refractometry, Ion implantation, Models, Chemical, ion implantation, diamond, refractive index, engineering, Photonics, Protons, business, Refractive index, Microfabrication, SINGLE-CRYSTAL DIAMOND
Abstract

An accurate control of the optical properties of single crystal diamond during microfabrication processes such as ion implantation plays a crucial role in the engineering of integrated photonic devices. In this work we present a systematic study of the variation of both real and imaginary parts of the refractive index of single crystal diamond, when damaged with 2 and 3 MeV protons at low-medium fluences (range: 10^15 - 10^17 cm^-2). After implanting in 125x125 um^2 areas with a scanning ion microbeam, the variation of optical pathlength of the implanted regions was measured with laser interferometric microscopy, while their optical transmission was studied using a spectrometric set-up with micrometric spatial resolution. On the basis of a model taking into account the strongly non-uniform damage profile in the bulk sample, the variation of the complex refractive index as a function of damage density was evaluated., 13 pages, 7 figures. arXiv admin note: text overlap with arXiv:1608.07122

Published
2016
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3. Dielectric versus topographic contrast in near-field microscopy

Author

Alain Dereux, Olivier J. F. Martin, and Christian Girard

Subjects
Physics, Silicon, Field (physics), Retrieval, Scattering, business.industry, media_common.quotation_subject, Near and far field, Dielectric, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Index, Surface, Optics, Electric field, Contrast (vision), Near-field scanning optical microscope, Computer Vision and Pattern Recognition, Tensor, Reconstruction, business, media_common, Channel Wave-Guides
Abstract

Using a fully vectorial three-dimensional numerical approach (generalized field propagator, based on Green's tensor technique), we investigate the near-field images produced by subwavelength objects buried in a dielectric surface. We study the influence of the object index, size, and depth on the near field. We emphasize the similarity between the near field spawned by an object buried in the surface (dielectric contrast) and that spawned by a protrusion on the surface (topographic contrast). We show that a buried object with a negative dielectric contrast (i.e., with a smaller index than its surrounding medium) produces a near-field image that is reversed from that of an object with a positive contrast. (C) 1996 Optical Society of America.

4. Optical magnetic near-field intensities around nanometer-scale surface structures

Author

Weeber, J. C., Dereux, A., Martin, O. J. F., Goudonnet, J. P., and Girard, C.

Subjects
Scattering, Physics::Optics, Light Confinement, Propagation, Gratings, Scanning Tunneling Microscope, Channel Wave-Guides, Index
Abstract

Recently, local probes used in optical experiments added a new dimension to the study of the optical properties of small particles lying on a surface. Until now, several theoretical frameworks, developed to understand the interaction of optical fields with mesoscopic and nanoscopic objects, emphasized mainly the prediction of the electric near-field distributions generated by these structures. This paper demonstrates how such subwavelength dielectric surface structures also produce a particular confinement of the optical magnetic near field when the sample is illuminated by a surface wave.

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