نتایج جستجو برای: near zero refractive index

تعداد نتایج: 790784  

Journal: :Proceedings of the National Academy of Sciences 2020

2011
Shotaro Nagai Atsushi Sanada Tsunayuki Yamamoto Hiroshi Kubo

Negative refractive index characteristics of a uniaxial anisotropic slab with a negative component of the permeability tensor are first confirmed. A two-dimensional array of metallic spirals is fabricated on a dielectric substrate and the wave propagation guided by the structure is measured by near-field measurements at 4.5 GHz band. The ω-β relation is obtained by the measured phase distributi...

Journal: :Nanophotonics 2023

Abstract Using electrodynamical description of the average power absorbed by a conducting film, we present an expression for electric-field intensity enhancement (FIE) due to epsilon-near-zero (ENZ) polariton modes. We show that FIE reaches limit in ultrathin ENZ films inverse second losses. This is illustrated exemplary series aluminum-doped zinc oxide nanolayers grown atomic layer deposition....

Journal: :Optics express 2013
Braulio García-Cámara Raquel Gómez-Medina Juan José Sáenz Borja Sepúlveda

In this work we propose two novel sensing principles of detection that exploit the magnetic dipolar Mie resonance in high-refractive-index dielectric nanospheres. In particular, we theoretically investigate the spectral evolution of the extinction and scattering cross sections of these nanospheres as a function of the refractive index of the external medium (next). Unlike resonances in plasmoni...

2012
W. Neil Charman Adnan David A. Atchison

Transient hyperopic refractive shifts occur on a timescale of weeks in some patients after initiation of therapy for hyperglycemia, and are usually followed by recovery to the original refraction. Possible lenticular origin of these changes is considered in terms of a paraxial gradient index model. Assuming that the lens thickness and curvatures remain unchanged, as observed in practice, it app...

Journal: :Applied optics 2016
Junaid M Laskar P Shravan Kumar Stephan Herminghaus Karen E Daniels Matthias Schröter

Optically transparent immersion liquids with refractive index (n∼1.77) to match the sapphire-based aplanatic numerical aperture increasing lens (aNAIL) are necessary for achieving deep 3D imaging with high spatial resolution. We report that antimony tribromide (SbBr3) salt dissolved in liquid diiodomethane (CH2I2) provides a new high refractive index immersion l...

Journal: :Optics letters 2012
Xuewen Long Jing Bai Wei Zhao Razvan Stoian Rongqing Hui Guanghua Cheng

We report on the single-step fabrication of stressed optical waveguides with tubular depressed-refractive-index cladding in phosphate glasses by the use of focused femtosecond hollow laser beams. Tubelike low index regions appear under direct exposure due to material rarefaction following expansion. Strained compacted zones emerged in domains neighboring the tubular track of lower refractive in...

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