From ladan.abolghasemi@utoronto.ca Fri Nov 15 16:14:35 2002 Return-Path: Received: from bureau8.utcc.utoronto.ca (bureau8.utcc.utoronto.ca [128.100.132.18]) by helios.physics.utoronto.ca (8.9.3/8.9.3) with ESMTP id QAA6404444 for ; Fri, 15 Nov 2002 16:14:35 -0500 (EST) Received: from [128.100.138.117] ([128.100.138.117] HELO ladan ident: IDENT-NOT-QUERIED [port 3768]) by bureau8.utcc.utoronto.ca with SMTP id <235079-724>; Fri, 15 Nov 2002 16:14:07 -0500 Message-ID: <000501c28ceb$eba5f3c0$758a6480@ladan> From: "Ladan Abolghasemi" To: "Aephraim M. Steinberg" References: <200211112106.gABL6due009717@courses.ece.toronto.edu> <200211152046.PAA6090206@helios.physics.utoronto.ca> Subject: Abstract for presentation : Ladan ABolghasemi ( re-send as plain text) Date: Fri, 15 Nov 2002 16:14:01 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Status: R Photonic Crystal Slow-Light Enhancement of Non-linear Phase Sensitivity One of the most promising applications of photonic crystals already demonstrated experimentally is the possibility of creating compact optical devices, similar to the integrated circuits in electronics, but operating entirely with light. These will change the information and telecommunication industry. The size of high speed active elements is currently a critical problem in the path toward large scale optical integrations. The smallest all-optical and electro-optical switches are of the order of millimeter. The reason for this problem is that the changes in the index of refraction induced by electro-optical or nonlinear optical effects, which are used to operate the device, are very small. It is well known that nonlinear effects can be enhanced in systems with slow group velocity as a result of the compression of the local energy density. Slow group velocities of light in photonic crystals can lead to a decrease of the sizes of many photonic devices so that they can operate at much smaller input powers. In this presentation after a brief talk about the photonic crystal systems and the photonic switches I will explain how very slow group velocities of light, which are achievable in photonic crystals, can considerably increase the induced phase shifts due to small changes in the index of refraction. Such increased phase sensitivity may be used to decrease the sizes of many devices, including switches, routers, all-optical logical gates, wavelength converters, etc. At the same time, a small group velocity significantly decreases the power requirements required to operate these devices. I will also show how these advantages can be used to design all-optical logical gates smaller than 20microns by 200microns in size, using readily available materials, and at modest levels of power. With this approach, one could have 100000 such devices on a surface 2cm by 2cm, making it an important step towards large-scale all-optical integration ----- Original Message ----- From: "Aephraim M. Steinberg" To: "Ladan Abolghasemi" Sent: Friday, November 15, 2002 3:46 PM Subject: Re: Abstract for presentation : Ladan ABolghasemi > Please send this as plain text-- thank you, > > Aephraim Steinberg > >