超光速与慢光现象及其应用前景

http://www.optics.rochester.edu/workgroups/boyd/nonlinear.html
Alexander L. Gaeta —— Quantum & nonlinear optics group
Brillouin Scattering in Generated Slow Light Raman Scattering in Generated Slow Light
"Superluminal and Slow Light Propagation in a RoomTemperature Solid" Matthew S. Bigelow, Nick N. Lepeshkin,and Robert W. Boyd Science, Vol. 301, (11 July 2003) "Observation of Ultraslow Light Propagation in a Ruby Crystal at Room Temperature" Matthew S. Bigelow, Nick N. Lepeshkin,and Robert W. Boyd Physical Review Letters, Vol. 90, No. 11 (21 March 2003) "Ruby slows light at room temperature" Philip Ball Nature, 26 March 2003
R. W. Boyd and P. Narum, "Slow- and fast-light : fundamental limitations," J. Modern Opt. 54, 2403 (2007).
要想产生快光/慢光 就要在增益谱/吸收谱上形成peak/dip
形成慢光/快光的几种方法:
材料色散
EIT(Electromagnetically induced transparency) CPO(Coherent population oscillation) OPA(Optical parametric amplification) SRS(Simulated Raman scattering) or SBS(Simulated Brillouin scattering)
材料色散
EIT(Electromagnetically induced transparency) CPO(Coherent population oscillation) OPA(Optical parametric amplification) SRS (Simulated Raman scattering) or SBS (Simulated Brillouin scattering)
Alexander L. Gaeta —— Quantum & nonlinear optics group
http://focus.aep.cornell.edu/
Daniel Gauthier —— Quantum electronics lab
http://www.phy.duke.edu/research/photon/qelectron/
OPA(Optical parametric amplification)
D. Dahan and G. Eisenstein, " Tunable all optical delay via slow and fast light propagation in a Raman assisted fiber optical parametric amplifier: a route to all optical buffering ," Opt. Express 13, 6234 (2005).
EIT(Electromagnetically induced transparency)
原理
ωp
ωc
探测光/信号光(弱光) 耦合光/泵浦光(强光)
http://en.wikipedia.org/wiki/Electromagnetically_Induced_Transparency
材料色散
EIT(Electromagnetically induced transparency) CPO(Coherent population oscillation) OPA(Optical parametric amplification) SRS(Simulated Raman scattering) or SBS(Simulated Brillouin scattering)
http://focus.aep.cornell.edu/
Daniel Gauthier —— Quantum electronics lab
Stored Light! Our paper on storing light in an optical fiber appeared in the December 14, 2007 issue of Science Magazine. See the links to the right to read more! "Stored light in an optical fiber via Stimulated Brillouin Scattering," Science 318, 1748 (2007).
L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas," Nature 397, 594 (1999).
超光速与慢光现象及其应用前景
报告人: 王姗姗 07春博 10711003 指导老师: 童利民 教授
基本概念
慢光—减慢光的传播群速度. 超光速 / 快光—加快光的传播群速度.
研究背景
1999年,Hau和Harris在Nature上发表, 利用EIT,在超低温Na原子中得到17m/s的 超慢光速.----引发了慢光和超光速的研究
Others
光纤中首个基于SBS效应的慢光现象
美国南加州大学电子工程与系统系Alan E. Willner 加拿大渥太华大学物理系的Xiaoyi Bao 英国南安普顿大学光电研究中心 法国GET电讯公司 德国应用科学大学Deutsche电讯中心 俄罗斯莫斯科罗蒙诺所福大学物理系 ……
国内主要研究组
材料色散
EIT(Electromagnetically induced transparency) CPO(Coherent population oscillation) OPA(Optical parametric amplification) SRS(Simulated Raman scattering) or SBS(Simulated Brillouin scattering)
CPO(Coherent population oscillation)
Spectral hole -> slow light Spectral antihole -> fast light
M. S. Bigelow, N. N. Lepeshkin and R. W. Boyd, "Superluminal and slow light propagation in a room-temperature solid, " Science 301, 200 (2003).
http://www.phy.duke.edu/research/photon/qelectron/
Amnon Yariv
Sagnac Effect in Coupled-Resonator SlowLight Waveguide Structures
http://www.aph.caltech.edu/people/yariv_a.html
课题意义
慢光具有更实际的研究价值
打破 "电子瓶颈" 全光存储 光开关 光雷达,量子信息处理等
国际主要研究组
Robert W. Boyd —— Nonlinear optics group
http://www.optics.rochester.edu/workgroups/boyd/nonlinear.html
光纤
模场:um 光纤长度: m-km um
是
简单
半导体
Ps-ns
是
适中
ns ns ns
um um mm
是 是 是
适中 复杂 简单
应用展望及存在的问题
前景展望
光延迟器,光缓存器,光存储器(全光网络中) .
哈尔滨工业大学(Ruby, Er-doped fiber) 上海交通大学(SBS, OPA) 吉林大学(EIT) 山西大学(Rb atom) 清华大学(PCF)
慢光/快光形成机理:
吸收 折射率 n随w剧烈变化 K-K关系 吸收随w剧烈变化
正ng 小vg 慢光, 负ng 负vg 快光.
R. W. Boyd and P. Narum, "Slow- and fast-light : fundamental limitations," J. Modern Opt. 54, 2403 (2007).
光子晶体材料
Y. R. Vlasov, M. O'Boyle, H. F. Hamann and S. J. Mcnab, "Active control of slow light on a chip with photonic crystal waveguides," Nature 438, 65 (2005).
材料色散 波导色散
材料色散
EIT(Electromagnetically induced transparency) CPO(Coherent population oscillation) OPA(Optical parametric amplification) SRS(Simulated Raman scattering) or SBS(Simulated Brillouin scattering)
谐振腔波导
波导采用增益系数更大的介质
Sagnac effect in coup百度文库ed-resonator CMRR(Cascaded micro-ring resonator)
CROW (Coupled Resonator Optical Waveguides)
J. Scheuer, and A. Yariv, "Sagnac effect in coupled-resonator slow-light waveguide structure,"
SBS(Simulated Brillouin scattering)
Slow light
Fast light
L. Thévenaz, "Slow and fast light in optical fibers," Nature photonics 2, 474 (2008).
波导色散
光子晶体材料 谐振腔波导
Amnon Yariv
http://www.aph.caltech.edu/people/yariv_a.html
Others
Robert W. Boyd —— Nonlinear optics group
Slow Light in Ruby and Other Materials Slow and Fast Light in Artificial Materials
慢光研究现状对比
材料 原子蒸汽 原理 Na/Rb/Cs蒸汽-EIT SBS SRS OPA 半导体量子阱/量子点/ 半导体光放大器-CPO SOI微环-波导色散 光子晶体-波导色散 晶体 紫翠玉,红宝石晶体CPO 延迟量 ns ns 带宽 MHzGHz GHzTHz GHzTHz GHzTHz GHzTHz MHz 器件尺寸 cm 室温工作 否 制作难度 适中