Nelson V. Tabiryan

Beam Engineering for Advanced Measurements (United States)

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Co-Authors

Timothy J. Bunning

Wright-Patterson Air Force Base

Boris Ya Zel'dovich

University of Central Florida

Sarik R. Nersisyan

Beam Engineering for Advanced Measurements (United States)

Luciano De Sio

Sapienza University of Rome

Brian R. Kimball

Combat Capabilities Development Command Soldier Center

Diane M. Steeves

Combat Capabilities Development Command Soldier Center

Svetlana V. Serak

Beam Engineering for Advanced Measurements (United States)

Cesare Umeton

University of Calabria

Svetlana Serak

Beam Engineering for Advanced Measurements (United States)

David E. Roberts

Concord Repatriation General Hospital

Cooperative Institutions

University of Central Florida

Beam Engineering for Advanced Measurements (United States)

Wright-Patterson Air Force Base

United States Air Force Research Laboratory

National Research Council

University of Calabria

Yerevan State University

Istituto Nanoscienze

Istituto di Nanotecnologia

Photonics (United States)

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BRIEFING: Beam reconstruction by iteration of electromagnetic field with induced nonlinearity gauge

Maxim Bolshtyansky Nelson V. Tabiryan Boris Ya Zel'dovich

10.1109/cleo.1997.603129

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Citations (0)

Hysteresis of Light Induced Fréedericks Transition due to the Static Electric Field

Molecular crystals and liquid crystals (1984)

Sarik R. Nersisyan Nelson V. Tabiryan

Abstract It is shown that when a quasistatic electric field (not inducing the Freedericks transition) is applied to a cell with a nematic liquid crystal (NLC), a hysteresis can arise in the dependence of the NLC director reorientation on the intensity. The critical tension of the static field inducing hysteresis is calculated.

Hysteresis

Quasistatic process

Fréedericksz transition

Critical field

Intensity

10.1080/00268948408072498

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Citations (15)

Plasmonic photoheating of gold nanorods in thermo-responsive chiral liquid crystals

Journal of Optics (2016)

Luciano De Sio Tiziana Placido Roberto Comparelli M. Lucia Curri Nelson V. Tabiryan

We report on the thermo-optical properties of gold nanorods (GNRs) dispersed in a thermotropic cholesteric liquid crystal (CLC). We have characterized the CLC reflection band behavior for two different cell thicknesses under the influence of a suitable (resonant) pump beam. It turns out that for the 1.6 μm thick cell there is a suppression of the CLC reflection band for both pure CLC and CLC/GNRs. For the 10 μm thick cell, the presence of GNRs desensitizes the shift of the CLC reflection band to temperature. Suitable cell design enables one to 'turn off' the wavelength shift of the peak reflection, thereby turning the system into a pure amplitude measurement tool. This has implications where the probe wavelength is fixed at a common, single wavelength.

Nanorod

Thermotropic crystal

Reflection

Cholesteric liquid crystal

10.1088/2040-8978/18/12/125005

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Citations (9)

Laser Beam Shaping using Self-Focusing in a Nematic Liquid Crystal

Molecular Crystals and Liquid Crystals (2006)

Andriy Shevchenko A. Hakola S.C. Buchter M. Kaivola Nelson V. Tabiryan

A simple and efficient method to convert a Gaussian laser beam into a nearly non-diverging Bessel-like beam or into a thin-walled hollow beam is described. The optical system used for the beam conversion consists of a thin liquid-crystal cell and one or two lenses. At certain parameter values, self-focusing of a Gaussian beam directly results in the formation of a narrow Bessel-like beam, and, if an additional lens is used to collimate the self-focused beam, the collimated beam shows an accurate ring-shaped profile.

Beam parameter product

M squared

Collimated light

Bessel beam

Gaussian beam

Beam expander

Self-focusing

Axicon

10.1080/15421400600654348

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Citations (2)

Gold Nanorods: Plasmonic Photoheating

Taylor & Francis eBooks (2015)

Luciano De Sio Tiziana Placido Roberto Comparelli M. Lucia Curri Nelson V. Tabiryan

Nanorod

10.1081/e-enn3-120053585

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Creation and control of twist in nematic liquid crystal director via bulk photoalignment

Sarah Hicks Kyungmin Lee Michael E. McConney Nicholas P. Godman Nelson V. Tabiryan

Photoalignment of azobenzenes is one of the most versatile tools for liquid crystal self-assembly for both the surface and bulk. An azobenzene component is homogenously mixed with a liquid crystal and irradiated with polarized visible light. By utilizing a simple two-step exposure method, we can induce photoalignment on the front and back of the liquid crystal sample independently. This back to front alignment, if varying in LC director orientation, translates into a twist through the bulk. In this talk, we discuss the two-step exposure method and how to control the twist as well as introduce characterization methods on twist quantification.

Azobenzene

Characterization

Crystal (programming language)

Sample (material)

10.1117/12.2608200

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Light Sensitive Liquid Crystals for All-Optical Photonic Devices

Molecular Crystals and Liquid Crystals (2012)

Luciano De Sio Alessandro Tedesco Svetlana Serak Nelson V. Tabiryan Cesare Umeton

We report our recent efforts on the fabrication and characterization of light responsive devices realized in soft composite materials. Periodic microstructures obtained by means of a photolithographic technique and a chemical etching process have been used to micro confine a light responsive liquid crystal stabilized through a self-organization processes. The high quality, light responsive, periodic microstructures have been exploited for realizing different all-optical, fast and low power applications. An overview of the realized photonic devices is presented.

Characterization

Optical power

10.1080/15421406.2012.663194

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Citations (3)

Adaptive liquid lens actuated by photo-polymer

Optics Express (2009)

Su Xu Hongwen Ren Yeong-Jyh Lin M. G. Moharam Shin‐Tson Wu

An adaptive liquid lens actuated by a photo-polymer is demonstrated. The lens cell consists of a top glass substrate and a bottom plastic slab with two holes: reservoir hole and lens hole, which are sealed with elastic membranes. A photo-sensitive polymer is attached to the membrane of the reservoir hole. Under blue light irradiation, the polymer is bent which exerts a pressure to regulate the curvature of the membrane on the lens hole and then change the focal length of the plano-convex lens. The focal length is tunable from infinity to 21.2 mm in seconds. Non-mechanical driving, easy integration with other optical components and compact system are the key features of this lens.

Slab

10.1364/oe.17.017590

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Citations (72)

Advances in Anisotropic Materials for Optical Switching

Brian R. Kimball Diane M. Steeves Landa Hoke Richard M. Osgood Joel Carlson

Abstract : There is continued interest within the Department of Defense to develop new photonic materials to address a wide range of Warfighter needs such as target designation, Soldier identification, communication, visual displays, active and passive optical filtering, and chemical and biological sensing. Optical switching is an area of particular interest. In general, new optical materials are required that can switch their transmission state on and off quickly, that have high optical quality, that can operate over a broad and controllable range of wavelengths, and that are inexpensive and highly manufacturable. As a result of recent progress by researchers at NSRDEC, BEAM Engineering for Advanced Measurements Co. (BEAM). and Massachusetts Institute of Technology Lincoln Laboratory (MITLL), materials now exist that bring us closer to realizing these goals.

Optical engineering

Source

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Citations (3)

Experimental Verification of a Bigrating Beam Rider

Physical Review Letters (2019)

Ying-Ju Lucy Chu Nelson V. Tabiryan Grover A. Swartzlander

An optical beam rider making use of a light sail comprising two opposing diffraction gratings is experimentally demonstrated for the first time. We verify that the illuminated space-variant grating structure provides an optical restoring force, exhibiting stable oscillations when the bigrating is displaced from equilibrium. We further demonstrate parametric cooling by illuminating the sail with synchronized light pulses. This experiment enhances the technical feasibility of a laser-driven light sail based on diffractive radiation pressure.Received 11 September 2019DOI:https://doi.org/10.1103/PhysRevLett.123.244302© 2019 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasClassical mechanicsCooling & trappingLight-matter interactionOptomechanicsAtomic, Molecular & OpticalGeneral Physics

Radiation Pressure

10.1103/physrevlett.123.244302

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Citations (34)