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Photonic Applications (photonic + application)

Distribution by Scientific Domains
Polymers and Materials Science50%

Selected Abstracts

Nanotube,Polymer Composites for Ultrafast Photonics

ADVANCED MATERIALS, Issue 38-39 2009
Tawfique Hasan
Abstract Polymer composites are one of the most attractive near-term means to exploit the unique properties of carbon nanotubes and graphene. This is particularly true for composites aimed at electronics and photonics, where a number of promising applications have already been demonstrated. One such example is nanotube-based saturable absorbers. These can be used as all-optical switches, optical amplifier noise suppressors, or mode-lockers to generate ultrashort laser pulses. Here, we review various aspects of fabrication, characterization, device implementation and operation of nanotube-polymer composites to be used in photonic applications. We also summarize recent results on graphene-based saturable absorbers for ultrafast lasers. [source]

Numerical simulation of anisotropic elastic fields of a GaAs/GaAs twist boundary

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 9 2007
Salah Madani
Abstract Self-assembled nanostructures are particularly interesting for optoelectronic and photonic applications, especially on silicon and GaAs substrates. Nevertheless, their long-range spatial distribution is random, their density is difficult to control, their size distribution can be large and their shapes can be different. By overcoming these drawbacks, it should be possible to improve the performances of existing devices or to fabricate new ones. This work studies the possibility to order on a long range self-assembled nanostructures on a GaAs substrate, by means of the elastic fields induced at the surface by shallowly buried periodic dislocation networks. The needed strain and stress fields, generated by a square network of screw dislocations located between a finite layer of GaAs bonded onto a semi-infinite GaAs substrate, are calculated using anisotropic elasticity. The results obtained are compared to those obtained using isotropic elasticity. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Recent developments in the use of two-photon polymerization in precise 2D and 3D microfabrications,

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 2 2006
Kwang-Sup Lee
Abstract The use of two-photon polymerization (TPP) initiated by a photosensitizer's non-linear two-photon absorption in two- and three-dimensional (2D and 3D) microfabrications for various photonic applications has been intensively studied. Since TPP emerged as a new technology over a decade ago, a large variety of micro-objects including 3D micro-optical components, micromechanical devices, and 3D photonic crystals have been fabricated using TPP with a high spatial resolution of approximately submicron scale to 100,nm. Recent efforts have been made to improve the fabrication efficiency and precision of micro-objects obtained with TPP; in particular, many studies have been carried out with the aim of developing efficient two-photon absorbing chromophores. In this article, efforts to develop highly efficient two-photon absorbing materials and also describe recent attempts to enhance the resolution and improve the fabrication efficiency of nanofabrications based on two-photon polymerization are discussed. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Photorefractive effect of ferroelectric liquid crystals

THE CHEMICAL RECORD, Issue 1 2006
Takeo Sasaki
Abstract This paper reviews our recent work on the photorefractive effect of ferroelectric liquid crystals (FLCs). The photorefractive effect is defined as the optical modulation of the refractive index of a medium as a result of a variety of processes. The interference of two laser beams in a photorefractive material establishes a refractive index grating. This phenomenon enables the creation of different types of photonic applications. FLCs exhibit fast electric field response, and the orientation of the molecular axis of FLCs changes its direction according to the change in direction of the spontaneous polarization (Ps). When two laser beams interfere in a photoconductive FLC, an orientational grating is formed. The mechanism of the formation of the grating is based on the response of the Ps to the photoinduced internal electric field. The time of formation of the refractive index grating is significantly shorter in FLC materials. © 2006 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 6: 43,51; 2006: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.20071 [source]