A semiclassical coupled-wave theory is developed for TE waves in one-dimensional periodic structures. The theory is used to calculate the bandwidths and reflection/transmission characteristics of such structures, as functions of the incident wave frequency. The results are in good agreement with exact numerical simulations for an arbitrary angle of incidence and for any achievable refractive index contrast on a period of the structure.
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http://dx.doi.org/10.1103/PhysRevE.69.016612 | DOI Listing |
J Chem Phys
September 2016
Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
We present a coupled wave semiclassical theory to describe plasmonic enhancement effects in surface-enhanced femtosecond stimulated Raman scattering (SE-FSRS). A key result is that the plasmon enhanced fields which drive the vibrational equation of motion for each normal mode results in dispersive lineshapes in the SE-FSRS spectrum. This result, which reproduces experimental lineshapes, demonstrates that plasmon-enhanced stimulated Raman methods provide unique sensitivity to a plasmonic response.
View Article and Find Full Text PDFChem Sci
August 2016
Theoretical Division , Los Alamos National Laboratory , Los Alamos , NM , USA . Email: ; Email: ; Email:
Accurate simulation of the non-adiabatic dynamics of molecules in excited electronic states is key to understanding molecular photo-physical processes. Here we present a novel method, based on a semi-classical approximation, that is as efficient as the commonly used mean field Ehrenfest or surface hopping methods and properly accounts for interference and decoherence effects. This novel method is an extension of Heller's thawed Gaussian wave-packet dynamics that includes coupling between potential energy surfaces.
View Article and Find Full Text PDFJ Chem Phys
January 2009
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
The femtosecond stimulated Raman scattering (FSRS) difference spectra of CDCl(3) from the ground potential energy surface, with and without off-resonance impulsive stimulated Raman pumping, taken at various delay times from the impulsive pump by Kukura et al. [Phys. Rev.
View Article and Find Full Text PDFPhys Rev E Stat Nonlin Soft Matter Phys
October 2004
Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1.
Semiclassical coupled wave theory is extended to waves with the electric field polarized parallel to the plane of incidence (TM waves) in one-dimensional periodic dielectric structures. Using this theory, the bandwidths and reflection/transmission characteristics of such structures, as functions of the incident wave frequency, are in good agreement with exact numerical simulations even for very high refractive index contrast.
View Article and Find Full Text PDFPhys Rev E Stat Nonlin Soft Matter Phys
January 2004
Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1.
A semiclassical coupled-wave theory is developed for TE waves in one-dimensional periodic structures. The theory is used to calculate the bandwidths and reflection/transmission characteristics of such structures, as functions of the incident wave frequency. The results are in good agreement with exact numerical simulations for an arbitrary angle of incidence and for any achievable refractive index contrast on a period of the structure.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!