Nonlinear Optical Properties of Materials最新文献_第3页

Nonlinear Optical Susceptibilities; Beyond the Local Field Approximation 非线性光学磁化率;超越局部场近似

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.mb3

S. Mukamel, J. Knoester

{"title":"Nonlinear Optical Susceptibilities; Beyond the Local Field Approximation","authors":"S. Mukamel, J. Knoester","doi":"10.1364/nlopm.1988.mb3","DOIUrl":"https://doi.org/10.1364/nlopm.1988.mb3","url":null,"abstract":"The Bloch-Maxwell equations are usually derived for isolated molecules interacting with an external electromagnetic field. This is justified in the limit of low molecular density, where intermolecular forces may be neglected. The problem which we address in this work is how to extend these equations in a systematic way to incorporate properly intermolecular forces. We thus develop a systematic microscopic basis for the calculation of nonlinear response functions and susceptibilities. Such a theory is essential for relating microscopic, single-molecule, polarizabilities to the macroscopic susceptibilities of optical materials. The local field approximation [1,2] is a mean-field procedure which is widely used in the calculation of molecular susceptibilities at finite densities, when intermolecular forces are important. The local field model provides a simple way to relate the polarizabilities of isolated molecules to the macroscopic susceptibilities. It is clear, however, that this procedure is not rigorous. It fails to take properly into account the correlated dynamics of the interacting many-body system, i.e., correlations among the molecules, as well as correlations between the molecules and the radiation field. Short-range forces (e.g., exchange) are totally neglected in this procedure. Moreover, even the dipoledipole forces are not fully taken into account. The resulting susceptibilities do not depend at all on the wavevectors (apart from the local field contribution) but just on the frequencies. This indicates that processes such as exciton migration and energy transfer and transport (e.g., the Forster transfer) are neglected in this procedure. Such processes are often added phenomelogically in order to interpret transient grating spectroscopy[3], which is a four-wave mixing technique that measures transport processes by following the wavevector dependence of the susceptibilities. The common derivation of the local field approximation cannot be extended to include these processes, since it is intrinsically a mean-field single molecule theory.","PeriodicalId":208307,"journal":{"name":"Nonlinear Optical Properties of Materials","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131216737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Twenty-Five Years of Nonlinear Optics 非线性光学25年

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.me1

N. Bloembergen

引用次数: 0

Third-Order Optical Susceptibility in n-i-p-i GaAs Arising from Nonparabolic Electronic Subbands 非抛物电子子带引起的n-i-p-i GaAs的三阶光磁化率

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.md3

K. Choquette

引用次数: 0

Nonlinear Measurements of High-Index Glasses 高折射率玻璃的非线性测量

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.tha2

D. Hall, N. Borrelli, W. H. Dumbaugh, M. Newhouse, D. Weidman

引用次数: 1

Photorefractive Optical Nonlinearities 光折变光学非线性

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.mc1

A. Glass

引用次数: 0

Crystals for Nonlinear Optics 非线性光学晶体

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.wc1

C. L. Tang, L. Cheng, W. Bosenberg, H. Nakatani

引用次数: 0

Superradiative Decay and Enhanced Optical Nonlinearity of Excitons in Qunatum Wells 量子阱中激子的超辐射衰减和增强光学非线性

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.tud1

E. Hanamura

引用次数: 0

Second Harmonic Generation in β-Barium Borate using Elliptical Focussing 椭圆聚焦在β-硼酸钡中产生二次谐波

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.mf5

T. Freegarde, J. Coutts, A. Corney

引用次数: 0

Optical Nonlinearities in Organics 有机物中的光学非线性

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.ma1

G. Meredith

引用次数: 0

Theoretical Considerations on Second-Order Nonlinearities of Organic Molecules 有机分子二阶非线性的理论思考

Nonlinear Optical Properties of Materials Pub Date : 1900-01-01 DOI: 10.1364/nlopm.1988.ma2

G. Wagnière, J. Hutter

{"title":"Theoretical Considerations on Second-Order Nonlinearities of Organic Molecules","authors":"G. Wagnière, J. Hutter","doi":"10.1364/nlopm.1988.ma2","DOIUrl":"https://doi.org/10.1364/nlopm.1988.ma2","url":null,"abstract":"It is now widely recognized that the long-wavelength second-order nonlinear optical properties of organic molecules which absorb in the visible or near-UV, may be reasonably well interpreted by semiempirical quantum chemical calculations. Methods such as PPP (taking into account only π electrons), CNDO or INDO (including also σ valence electrons), are generally used in conjunction with the sum-over-states expressions to obtain the tensor elements of β(ω1 + ω2; −ω1, −ω2). Such calculations may predict correct orders of magnitude, show the relative influence of donor and acceptor substituents, and enable one to identify the dominant contributions to particular tensor elements. Although these methods have a common-structure, namely a SCF part followed by some configuration interaction (CI), they also present severe limitations. They are based on a number of particular approximations, and certain intermediate quantities are calibrated on empirical data, which makes in general the results parameter-dependent1-4). This raises the question on how the situation may be improved. With the advent of large-scale vectorized computers, the possibilities of obtaining better molecular wave-functions also by ab initio methods seem promising. How will this affect the computation of nonlinear optical susceptibilities?","PeriodicalId":208307,"journal":{"name":"Nonlinear Optical Properties of Materials","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134373781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0