学术报告
题目：Stokes polarimetry- its principles, practices and potentials
报告人：Tiehan Shen（沈铁汉）
Joule Physics Laboratory, School of Computing, Science and Engineering, College of Science and Technology, University of Salford, Newton Building, Salford, M5 4WT, The United Kingdom
时间：2012年8月24日（周五），14:00-15:00 PM
地点：生命科学学院208会议室
Abstract
The polarisation states of light have fascinated scientists for centuries. Sir Isaac Newton asked in Question 26 of Opticks: "Have not the rays of light several sides, endued with several original properties?" This is an elegant, albeit a bit old fashioned, way of saying light has polarisation and its scattering and reflection properties depend on the alignment of the light beam not just its direction of travel.
Stokes parameters fully characterise the polarisation state of light in an experimentally accessible manner. Modern photoelastic modulator (PEM) based Stokes polarimetry offers a very high sensitivity which is particularly suitable, for instance, for the investigation of the magneto-optical properties of nanostructured magnetic materials. In this talk, a robust methodology recently developed, which utilizes a dual PEM setup, is described. The principles of Stokes polarimetry, practical implementations and potential future challenges are examined. A few examples of its application in the magneto-optical characteristics of nanostructured materials are presented. In particular a proof-of-concept experiment on cardiac cells will be reported.
Brief curriculum vitae
Dr. Tiehan Shen`s research career has taken him from Peking University (BSc 1982), to Cambridge (PhD 1988), then to Cardiff (PDRA), Leeds (Lectureship in Physics, 1992) and Salford (Readership in Magnetism, 2000). In recent years he has been interested in the fabrication and characterisation of nanostructured materials, in particular magnetic nanostructures and their magneto-optical characteristics. A ‘spin off` from the research activities is the development of a novel polarisation microscope for application in life science research, which is being actively pursued in collaboration with biologists at Salford and Manchester. He has co-authored over seventy publications in peer-reviewed journals. The field of research covered by these works falls broadly within Condensed Matter Physics and Functional Materials.
联系人：王世强（电话：62755002），秦咏梅（电话：62758885）
欢迎各位老师和同学积极参加！