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Slow Light Enhanced Nano-Photonic Devices for Optical Communication and Sensing

Monday, November 14, 2011 -
4:00pm to 4:50pm
KEC 1001

Speaker Information

Alan X. Wang
Assistant Professor
School of EECS
Oregon State University


<p><span data-scayt_word="Nano‐photonic" data-scaytid="81">Nano‐photonic</span> devices are playing increasingly important roles in optical communication and optical sensor systems. By engineering the <span data-scayt_word="nano‐photonic" data-scaytid="82">nano‐photonic</span> structures, for example, by fine-tuning the <span data-scayt_word="photonic" data-scaytid="83">photonic</span> band diagram of <span data-scayt_word="photonic" data-scaytid="84">photonic</span> crystal <span data-scayt_word="waveguides" data-scaytid="86">waveguides</span>, one can slow down the group velocity of the photons by two orders of magnitude, which can significantly increase the <span data-scayt_word="light‐matter" data-scaytid="87">light‐matter</span> interaction. In this presentation, I will discuss the design and fabrication of an innovative <span data-scayt_word="photonic" data-scaytid="85">photonic</span> crystal slot <span data-scayt_word="waveguide" data-scaytid="88">waveguide</span> on <span data-scayt_word="silicon‐on‐insulator" data-scaytid="90">silicon‐on‐insulator</span> (<span data-scayt_word="SOI" data-scaytid="91">SOI</span>) wafers, with special emphasis on coupling light from conventional optical fibers into slow light enhanced <span data-scayt_word="nanophotonic" data-scaytid="92">nanophotonic</span> <span data-scayt_word="waveguide" data-scaytid="89">waveguide</span>.</p><p>Based on this <span data-scayt_word="ultra‐efficient" data-scaytid="93">ultra‐efficient</span> platform, we have developed highly compact (<span data-scayt_word="300μm" data-scaytid="94">300μm</span>) and sensitive <span data-scayt_word="on‐chip" data-scaytid="95">on‐chip</span> optical sensors for water quality monitoring (<span data-scayt_word="50ppb" data-scaytid="96">50ppb</span> <span data-scayt_word="xylene" data-scaytid="97">xylene</span> in water) and <span data-scayt_word="green‐house" data-scaytid="98">green‐house</span> gas detection (<span data-scayt_word="100ppm" data-scaytid="99">100ppm</span> methane in nitrogen). When the slow light enhanced <span data-scayt_word="nano‐photonic" data-scaytid="100">nano‐photonic</span> <span data-scayt_word="waveguide" data-scaytid="102">waveguide</span> is combined with other innovative materials, we can create various <span data-scayt_word="photonic" data-scaytid="104">photonic</span> devices with enhanced functionalities for a broad spectrum of applications in board level optical interconnect, radio frequency (<span data-scayt_word="RF" data-scaytid="107">RF</span>) <span data-scayt_word="photonic" data-scaytid="105">photonic</span> communication, electromagnetic wave detection, and <span data-scayt_word="bio‐molecule" data-scaytid="108">bio‐molecule</span> sensing. I will show the <span data-scayt_word="state‐of‐the‐art" data-scaytid="109">state‐of‐the‐art</span> design of a <span data-scayt_word="nano‐photonic" data-scaytid="101">nano‐photonic</span> modulator using <span data-scayt_word="E‐O" data-scaytid="110">E‐O</span> polymer infiltrated silicon <span data-scayt_word="photonic" data-scaytid="106">photonic</span> crystal slot <span data-scayt_word="waveguide" data-scaytid="103">waveguide</span> with unprecedented efficiency, and experimental demonstration of <span data-scayt_word="735pm" data-scaytid="112">735pm</span>/V <span data-scayt_word="in‐device" data-scaytid="113">in‐device</span> <span data-scayt_word="E‐O" data-scaytid="111">E‐O</span> coefficient and 0.44Vmm of <span data-scayt_word="VπL" data-scaytid="114">VπL</span>, which is ten times better than the best results of our competitors.</p><p>In summary, slow light enhanced <span data-scayt_word="nano‐photonic" data-scaytid="115">nano‐photonic</span> <span data-scayt_word="photonic" data-scaytid="116">photonic</span> devices have demonstrated extremely high potential in many communication and sensing areas, and will continue to broaden its application in many emerging fields through interdisciplinary research.</p>

Speaker Bio

Alan X. Wang is an assistant professor of the School of Electrical Engineering and Computer Science at Oregon State University. He received his B.S. degree from Tsinghua University, and M.S. degree from the Institute of Semiconductors, Chinese Academy of Sciences, Beijing, P.R. China, in 2000 and 2003, respectively, and his Ph.D. degree in Electrical and Computer Engineering from the University of Texas at Austin in 2006. From January 2007 to August 2011, he was with Omega Optics, Inc., Austin, Texas, where he served as the Chief Research Scientist.