掺杂有反转缺陷的金属纳米球的胆甾体光谱

IF 1.2 4区 物理与天体物理 Q4 OPTICS
G. Reyes, J. A. Reyes
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引用次数: 0

摘要

我们正在考虑圆偏振光通常入射到掺杂有金属球的胆甾醇弹性体平板上的传播。平板由两层组成:第一层是右旋手性结构,第二层是左旋螺旋;然而,手性结构的间距保持不变。我们建立了一个理论模型,用数值方法计算圆偏振光入射到平板上的反射光谱和透射光谱。我们考虑了沿螺旋轴的机械应变的影响,因为施加在结构上的力可以使板中的介子沿螺旋轴倾斜。弹性体平板的光子带隙(PBG)由于应变而变窄;在那里,我们还观察到高反射率(超反射率),这取决于银掺杂的填充因子以及缺陷是否位于包含结构完整周期的位置。此外,光谱显示了右偏振光和左偏振光的反射带。我们用材料参数来表示PBG边;这允许我们为反射带选择电磁频谱的区域。当右旋和左旋螺旋层的间距相同时,这种介质表现出超反射光子带。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optical spectra for a cholesteric elastomer doped with metallic nanospheres with an inversion defect
We are considering the propagation of circularly polarized light normally impinging on a cholesteric elastomer slab doped with metallic spheres. The slab is composed of two layers: the first layer is a right-handed chiral structure, and the second one is a helix with left-handedness; however, the pitch of the chiral structure remains constant. We performed a theoretical model to find numerically, reflection and transmission spectra for circularly polarized light impinging on the slab. We considered the effects of mechanical strains along the helical axis since the force exerted on the structure can tilt the mesogens in the slab along the helical axis. The Photonic Band-Gap(PBG) of the elastomer slab becomes narrowed because of the strain; there we also observe high reflectance (hyper-reflectivity) that depends on the filling factor of the silver doping and on whether the defect is located at a position that contains complete periods of the structure. Additionally, the spectra display reflection bands for both right- and left-polarized light. We expressed the PBG edges in terms of material parameters; this allows us to select the region of the electromagnetic spectrum for the reflection bands. This medium exhibits a hyper-reflective photonic band when the pitches of both right- and left-handed helical layers are identical.
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来源期刊
Journal of Modern Optics
Journal of Modern Optics 物理-光学
CiteScore
2.90
自引率
0.00%
发文量
90
审稿时长
2.6 months
期刊介绍: The journal (under its former title Optica Acta) was founded in 1953 - some years before the advent of the laser - as an international journal of optics. Since then optical research has changed greatly; fresh areas of inquiry have been explored, different techniques have been employed and the range of application has greatly increased. The journal has continued to reflect these advances as part of its steadily widening scope. Journal of Modern Optics aims to publish original and timely contributions to optical knowledge from educational institutions, government establishments and industrial R&D groups world-wide. The whole field of classical and quantum optics is covered. Papers may deal with the applications of fundamentals of modern optics, considering both experimental and theoretical aspects of contemporary research. In addition to regular papers, there are topical and tutorial reviews, and special issues on highlighted areas. All manuscript submissions are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. General topics covered include: • Optical and photonic materials (inc. metamaterials) • Plasmonics and nanophotonics • Quantum optics (inc. quantum information) • Optical instrumentation and technology (inc. detectors, metrology, sensors, lasers) • Coherence, propagation, polarization and manipulation (classical optics) • Scattering and holography (diffractive optics) • Optical fibres and optical communications (inc. integrated optics, amplifiers) • Vision science and applications • Medical and biomedical optics • Nonlinear and ultrafast optics (inc. harmonic generation, multiphoton spectroscopy) • Imaging and Image processing
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