Results 181 to 190 of about 821 (229)

Numerical Analysis of Surface Relief Gratings

1997
Diffraction gratings are components of great interest for their many applications, for instance in integrated optics, holography and spectroscopy.1Among the methods introduced for the analysis of diffraction gratings one may recall the integral method,2the coupled wave method,1, 3and the differential method.4In this paper we will discuss a modal method
R. Orta, S. Bastonero, R. Tascone
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Optically induced surface relief gratings on azopolymers

SPIE Proceedings, 2000
Azobenzene containing amorphous polymers are used to fabricate thin films that can act as optical waveguides. Furthermore, stable surface relief structures such as gratings can be holographically inscribed onto the films using low and medium power lasers.
Paul L. Rochon, Almeria Natansohn
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Azobenzene‐Containing Polymers for Surface Relief Gratings

Macromolecular Symposia, 2009
AbstractWell defined azobenzene containing (co)polymers have been synthesized by atom transfer radical polymerization and subsequent polymeranalogeous reaction for introduction of the chromophores. Four different series were prepared varying only one of the following material parameters at a time, while keeping the others constant.
Volker Börger, Sven Pohle, Olga Kuliskovska, Kati Gharaggozloo‐Hubmann, Joachim Stumpe, Henning Menzel   +5 more
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Scatterometry: a metrology for subwavelength surface-relief gratings

SPIE Proceedings, 2001
Phase-modulation scatterometry is a metrology technique for determining the parameters of gratings using as a key device a phase modulator. For measurement purposes the phase modulator requires a complicated calibration procedure that is analyzed here in detail.
Petre-Catalin Logofatu, John R. McNeil
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Surface relief grating formation on nano-objects

Applied Physics Letters, 2009
We exploit the photoinduced migration effect in azopolymer thin films to induce surface relief patterning of nano-objects. Manipulation and precise control of the molecular order is achieved at the nanoscale. Interaction between a laser beam from an argon laser and the azopolymer nano-objects induces structures on the surface.
Barille, Régis, Tajalli, Peyman, Zielinska, Sonia, Ortyl, Ewelina, Kucharski, Stanislaw, Nunzi, Jean-Michel   +5 more
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Surface relief grating formation on an azo-polymer

SPIE Proceedings, 2003
Two types of photo-induced gratings, birefringence and surface relief gratings, were formed on an azo polymer film when two orthogonal circularly polarized writing beams irradiated the film. All the diffracted beams from the gratings were measured during irradiation and the surface relief height inscribed on the film was measured by using atomic force ...
Ui-Jung Hwang, Jung-Sung Kim, Se-Yen You, Hyun-Ki Lee, Cha-Hwan Oh, Seok-Ho Song, Pill-Soo Kim, Yang-Kyoo Han   +7 more
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Ceramic surface relief gratings imprinted on an optical fiber tip

Applied Optics, 2022
We report on the fabrication, experimental measurement, and numerical simulation of sol-gel diffraction grating structures deposited on the end-face of a single mode optical fiber. Using the imprint method, we manufactured surface relief grating structures in four configurations with different grating-relative-to-fiber arrangements.
Piotr Pala, Karolina Gemza, Piotr Kołodziej, Justyna Krzak, Andrzej Gawlik, Jacek Olszewski, Gabriela Statkiewicz-Barabach, Katarzyna Komorowska, Tadeusz Martynkien   +8 more
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Surface relief gratings in azo-polymers revisited

Journal of Applied Physics, 2018
We use the concept of vectorial photochemical tweezing to rationalize the experimental observations of surface relief gratings in azo-polymers, e.g., the photochemically induced motion of the polymer in a one-dimensional intensity gradient produced by two-laser beam interference.
S. Moujdi, A. Rahmouni, T. Mahfoud, D. V. Nesterenko, M. Halim, Z. Sekkat   +5 more
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PHOTOINDUCED SURFACE RELIEF GRATINGS ON AZOCELLULOSE FILMS

Journal of Macromolecular Science, Part A, 2001
Surface relief gratings (SRG) on films of azobenzene–modified cellulose (azocellulose) with ultrahigh molecular weight were holographically recorded in a single step. Surface modulation depth of the SRGs increased with the degree of substitution (DS) of the azobenzene chromophores in the cellulose as well as with the grating spacing.
Suizhou Yang, Lian Li, Ashok Cholli, Jayant Kumar, Sukant Tripathy   +4 more
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Dielectric surface-relief gratings with high diffraction efficiency

Applied Optics, 1984
Diffraction properties of dielectric surface-relief gratings were investigated by solving Maxwell’s equations numerically using the differential method. The diffraction efficiency of a grating with a groove depth about twice as deep as the grating period is comparable with the efficiency of a volume phase grating.
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