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[Springer Series in Optical Sciences] Fano Resonances in Optics and Microwaves Volume 219 (Physics and Applications) || Mueller Matrix Approach for Engineering Asymmetric Fano-resonance Line Shape in Anisotropic Optical System
摘要： The Fano resonances observed in diverse micro and nano optical systems have received particular attention due to their numerous potential applications like sensing, switching, lasing, ?lters and robust color display, nonlinear and slow-light devices, invisibility cloaking, and so forth. For most of these applications, it is highly desirable that the asymmetric spectral line shape of Fano resonance can be controlled or modulated by some experimentally accessible parameters. In this chapter, we discuss a new concept based on polarization Mueller matrix analysis for tuning the Fano interference effect and the resulting asymmetric spectral line shape in anisotropic optical system. The approach is founded on a generalized model of anisotropic Fano resonance and exploits the differential polarization response (anisotropy) of the two interfering modes to achieve unprecedented control over Fano resonance. Illustrative results on the use of the model for tuning Fano resonance in coupled plasmonic systems are presented. In this context, the fundamentals of polarized light, the mathematical framework of Stokes-Mueller formalism and the basic polarimetry parameters encoded in Mueller matrix are discussed. The speci?cs of a novel dark ?eld Mueller matrix spectroscopy system and its use for studying the polarization response of Fano resonance in plasmonic systems is illustrated with selected examples. The chapter concludes with an outlook on the prospects of the polarization-optimized anisotropic Fano resonant systems for applications involving control and manipulation of electromagnetic waves at the nano scale.
关键词： plasmonic systems,anisotropic optical system,Fano resonance,Mueller matrix,polarization control
更新于2025-09-09 09:28:46
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Using polarization control plate to suppress transverse stimulated Raman scattering in large-aperture KDP crystal
摘要： Transverse stimulated Raman scattering (TSRS) is strongly generated in the third-harmonic-generation crystal potassium dihydrogen phosphate (KDP) and can even damage the KDP crystal in inertial confinement fusion drivers. In this work, a method to suppress TSRS is proposed in which the polarization control plate (PCP) is moved to a new position in the existing optical path. The proposed method can suppress TSRS significantly and doubles the laser threshold intensity in KDP crystal when the order of the PCP is 16. This result is attributed to the reduction of the gain length for the Stokes radiation. The proposed method may also be used to suppress other nonlinear effects, including transverse stimulated Brillouin scattering in large-aperture optical components.
关键词： transverse stimulated Raman scattering,Polarization control plate,potassium dihydrogen phosphate (KDP)
更新于2025-09-04 15:30:14
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Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin–orbit momentum conservation
摘要： Optical interactions are governed by both spin and angular momentum conservation laws, which serve as a tool for controlling light–matter interactions or elucidating electron dynamics and structure of complex systems. Here, we uncover a form of simultaneous spin and orbital angular momentum conservation and show, theoretically and experimentally, that this phenomenon allows for unprecedented control over the divergence and polarization of extreme-ultraviolet vortex beams. High harmonics with spin and orbital angular momenta are produced, opening a novel regime of angular momentum conservation that allows for manipulation of the polarization of attosecond pulses—from linear to circular—and for the generation of circularly polarized vortices with tailored orbital angular momentum, including harmonic vortices with the same topological charge as the driving laser beam. Our work paves the way to ultrafast studies of chiral systems using high-harmonic beams with designer spin and orbital angular momentum.
关键词： attosecond high-harmonic beams,polarization control,vortex charge,spin–orbit momentum conservation,extreme-ultraviolet vortex beams
更新于2025-09-04 15:30:14