Conference: Travel Support for New MRS Symposium on Photo- Induced Space-Charge Effects in Semiconductors to be held inSan Francisco, CA, April 27 - May 1, 1992

一个新的专题讨论会将于1992年4月27日至5月1日在旧金山举行的材料研究学会春季会议上举行。研讨会的题目是：半导体中的光致空间电荷效应：光电导、光谱和电光。请为参加本次研讨会的学生和博士后提供旅费和报名费。在提交的摘要中，至少有两篇来自学生和博士后的论文将被提升到特邀演讲的地位。请为这两位演讲者提供旅行和注册。此外,为了确保优秀的演讲者能够参加那些不愿意参加的活动，需要为另外4名学生或博士后提供部分资金支持否则就有资源了。研讨会的技术内容主要围绕光折变效应及其在半导体结构中的应用展开。光折变效应是一种空间电荷现象。它的工作原理是在高阻样品中产生光载流子，然后在缺陷处进行光导传输和电荷捕获。光生空间电荷场通过电光效应改变样品的光学性质。光折变效应是全光控制和图像处理应用中最具吸引力的光学非线性之一，因为它需要很低的光强。这种弱光要求是缺陷上存储空间电荷的直接结果，允许随着时间的推移积累低光强度。应用包括位相共轭、光放大和空间光调制器。光折变效应的最新进展是利用量子受限结构的电光特性，ıNolte，1990！光致空间电荷在这些光折变量子阱中的作用类似于自电光器件中的反馈。

A new symposium is being arranged to take place April 27 - May 1, 1992 at the Spring Meeting of the Materials Research Society to be held in San Francisco. The title of the symposium is: Photo-Induced Space Charge Effects in Semiconductors: Photoconductivity, Spectroscopy and Electro-Optics. Travel and registration funds for students and post-doctoral attendees for this symposium is requested. Of the submitted abstracts, at least two from students and post-docs will be elevated to the status of invited talks. Travel and registrations for these two speakers are requested. In addition, funds for partial support for 4 additional students or post-docs are requested in order to ensure that good speakers will be able to attend who would not otherwise have the resources. The technical content of the symposium centers around the photorefractive effect and application to semiconductor structures. The photorefractive effect is a space- charge phenomena. It operates through the generation of photocarriers in a high- resistivity sample, followed by photoconductive transport and trapping of the charge at defects. The photogenerated space-charge fields alter the optical properties of the sample through the electro-optic effect. The photorefractive effect is one of the most attractive optical nonlinearity for applications of all-optical control and image processing because it requires very low light intensities. This low-light requirement is a direct consequence of the storage of space-charge on defects, allowing low light intensities to be integrated over time. Applications include phase conjugation, optical amplification and spatial light modulators. Recent advances in the photorefractive effect are using the electro-optic properties of quantum-confined structures ıNolte, 1990!. The role of the photo- induced space-charge in these photorefractive quantum wells is closely analogous to the feedback that occurs in self electro-optic devices.