scholarly journals Colossal magnetic fields in high refractive index materials at microwave frequencies

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
B. Luk`yanchuk ◽  
L. M. Vasilyak ◽  
V. Ya. Pecherkin ◽  
S. P. Vetchinin ◽  
V. E. Fortov ◽  
...  
Keyword(s):  
Refractive Index ◽  
Magnetic Fields ◽  
Electromagnetic Waves ◽  
Near Field ◽  
Resonant Scattering ◽  
High Refractive Index ◽  
New Paradigm ◽  
Microwave Frequencies ◽  
Opening Up ◽  
Vast Range

AbstractResonant scattering of electromagnetic waves is a widely studied phenomenon with a vast range of applications that span completely different fields, from astronomy or meteorology to spectroscopy and optical circuitry. Despite being subject of intensive research for many decades, new fundamental aspects are still being uncovered, in connection with emerging areas, such as metamaterials and metasurfaces or quantum and topological optics, to mention some. In this work, we demonstrate yet one more novel phenomenon arising in the scattered near field of medium sized objects comprising high refractive index materials, which allows the generation of colossal local magnetic fields. In particular, we show that GHz radiation illuminating a high refractive index ceramic sphere creates instant magnetic near-fields comparable to those in neutron stars, opening up a new paradigm for creation of giant magnetic fields on the millimeter's scale.

scholarly journals Collective photonic response of high refractive index dielectric metasurfaces

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Sushanth Reddy Amanaganti ◽  
Miha Ravnik ◽  
Jayasri Dontabhaktuni
Keyword(s):  
Refractive Index ◽  
Computer Modelling ◽  
Near Field ◽  
High Refractive Index ◽  
Tuning Parameter ◽  
Far Field ◽  
Strong Suppression ◽  
Perfect Absorption ◽  
Field Coupling ◽  
Multipole Analysis

Abstract Sub-wavelength periodic nanostructures give rise to interesting optical phenomena like effective refractive index, perfect absorption, cloaking, etc. However, such structures are usually metallic which results in high dissipative losses and limitations for use; therefore, dielectric nanostructures are increasingly considered as a strong alternative to plasmonic (metallic) materials. In this work, we show light-matter interaction in a high refractive index dielectric metasurface consisting of an array of cubic dielectric nano-structures made of very high refractive index material, Te in air, using computer modelling. We observe a distinct band-like structure in both transmission and reflection spectra resulting from the near-field coupling of the field modes from neighboring dielectric structures followed by a sharp peak in the transmission at higher frequencies. From the spatial distribution of the electric and magnetic fields and a detailed multipole analysis in both spherical harmonics and Cartesian components, the dominant resonant modes are identified to be electric and magnetic dipoles. Specifically at lower frequency (60 THz) a novel anapole-like state characterized by strong-suppression in reflection and absorption is observed, reported very recently as ‘lattice-invisibility’ state. Differently, at higher frequency (62 THz), strong absorption and near-zero far field scattering are observed, which combined with the field profiles and the multipole analysis of the near-fields indicate the excitation of an anapole. Notably the observed novel modes occur in the simple geometry of dielectric cubes and are a result of collective response of the metasurfaces. Periodicity of the cubic metasurface is shown as the significant material tuning parameter, allowing for the near-field and far-field coupling effects of anapole metasurface. More generally, our work is a contribution towards developing far-fetching applications based on metamaterials such as integrated devices and waveguides consisting of non-radiating modes.

Multi Layer Disk Design For Near Field Phase-Change Recording

2003 ◽  
Vol 803 ◽  
Author(s):  
Koichiro Kishima ◽  
Isao Ichimura ◽  
Kimihiro Saito ◽  
Kenji Yamamoto ◽  
Atsushi Iida ◽  
...  
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Layer Structure ◽  
Near Field ◽  
Numerical Aperture ◽  
High Refractive Index ◽  
Field Phase ◽  
Optical Setup ◽  
Field Recording ◽  
Signal Characteristics

ABSTRACTWe propose multi-layer near-field recording with using inner focus mode. The restricted conditions for multi-layer near-field recording are discussed from the viewpoint of both media structure and optical setup. One solution is presented for dual layer recording with a numerical aperture (NA) of 1.5 and a wavelength of 405 nm as a light source of GaN laser diode.In the proposed layer structure, a Nb2O5 material has been adopted as the intermediate layer because of its high refractive index, n = 2.4, in order to prevent the decrease of beam propagation that corresponds to NA>1. Almost the same signal characteristics can be obtained from both recording layers at the air gap of 40 nm. The adjustment of focusing position and the compensation of spherical aberrations have been implemented by the combination of an expander lens unit and a liquid crystal (LC) panel in the optical setup.

High-Density Near-Field Readout over 50 GB Capacity Using Solid Immersion Lens with High Refractive Index

2003 ◽  
Vol 42 (Part 1, No. 2B) ◽  
pp. 1101-1104 ◽  
Author(s):  
Masataka Shinoda ◽  
Kimihiro Saito ◽  
Takao Kondo ◽  
Tsutomu Ishimoto ◽  
Ariyoshi Nakaoki
Keyword(s):  
Refractive Index ◽  
Near Field ◽  
High Refractive Index ◽  
High Density ◽  
Solid Immersion Lens

scholarly journals The Quest for Low Loss High Refractive Index Dielectric Materials for UV Photonic Applications

2018 ◽  
Vol 8 (11) ◽  
pp. 2065 ◽  
Author(s):  
Yael Gutiérrez ◽  
Dolores Ortiz ◽  
José Saiz ◽  
Francisco González ◽  
Pablo Albella ◽  
...  
Keyword(s):  
Refractive Index ◽  
Near Infrared ◽  
Numerical Study ◽  
Near Field ◽  
Field Enhancement ◽  
Dielectric Materials ◽  
High Refractive Index ◽  
Heat Radiation ◽  
Aluminum Phosphide ◽  
Spectral Ranges

Nanostructured High Refractive Index (HRI) dielectric materials, when acting as nanoantennas or metasurfaces in the near-infrared (NIR) and visible (VIS) spectral ranges, can interact with light and show interesting scattering directionality properties. Also, HRI dielectric materials with low absorption in these spectral ranges show very low heat radiation when illuminated. Up to now, most of the studies of these kind of materials have been explored in the VIS-NIR. However, to the best of our knowledge, these properties have not been extended to the ultraviolet (UV), where their application in fields like photocatalysis, biosensing, surface-enhanced spectroscopies or light guiding and trapping can be of extraordinary relevance. Here, we present a detailed numerical study of the directional scattering properties, near-field enhancement and heat generation of several materials that can be good candidates for those applications in the UV. These materials include aluminum phosphide, aluminum arsenide, aluminum nitride, diamond, cerium dioxide and titanium dioxide. In this study, we compare their performance when forming either isolated nanoparticles or dimers to build either nanoantennas or unit cells for more complex metasurfaces.

scholarly journals Planar refraction and lensing of highly confined polaritons in anisotropic media

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. Duan ◽  
G. Álvarez-Pérez ◽  
A. I. F. Tresguerres-Mata ◽  
J. Taboada-Gutiérrez ◽  
K. V. Voronin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Free Space ◽  
Electromagnetic Waves ◽  
Anisotropic Media ◽  
High Refractive Index ◽  
Effective Control ◽  
Optical Effect ◽  
Light Bending ◽  
Natural Medium ◽  
Isotropic Media

AbstractRefraction between isotropic media is characterized by light bending towards the normal to the boundary when passing from a low- to a high-refractive-index medium. However, refraction between anisotropic media is a more exotic phenomenon which remains barely investigated, particularly at the nanoscale. Here, we visualize and comprehensively study the general case of refraction of electromagnetic waves between two strongly anisotropic (hyperbolic) media, and we do it with the use of nanoscale-confined polaritons in a natural medium: α-MoO3. The refracted polaritons exhibit non-intuitive directions of propagation as they traverse planar nanoprisms, enabling to unveil an exotic optical effect: bending-free refraction. Furthermore, we develop an in-plane refractive hyperlens, yielding foci as small as λp/6, being λp the polariton wavelength (λ0/50 compared to the wavelength of free-space light). Our results set the grounds for planar nano-optics in strongly anisotropic media, with potential for effective control of the flow of energy at the nanoscale.

High-Density Recording with a Near-Field Optical Disk System Using a Medium with a Top Layer of High Refractive Index

2009 ◽  
Vol 48 (3) ◽  
pp. 03A015 ◽  
Author(s):  
Tsutomu Ishimoto ◽  
Ariyoshi Nakaoki ◽  
Kimihiro Saito ◽  
Takeshi Yamasaki ◽  
Tomomi Yukumoto ◽  
...  
Keyword(s):  
Refractive Index ◽  
Near Field ◽  
High Refractive Index ◽  
Optical Disk ◽  
High Density ◽  
Disk System ◽  
High Density Recording

scholarly journals All-dielectric metasurfaces for polarization manipulation: principles and emerging applications

Nanophotonics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 3755-3780 ◽  
Author(s):  
Yueqiang Hu ◽  
Xudong Wang ◽  
Xuhao Luo ◽  
Xiangnian Ou ◽  
Ling Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Efficiency ◽  
High Refractive Index ◽  
Data Encryption ◽  
Optical Systems ◽  
Ohmic Loss ◽  
Imaging Data ◽  
New Paradigm ◽  
High Efficient ◽  
Low Efficiency

AbstractMetasurfaces, composed of specifically designed subwavelength units in a two-dimensional plane, offer a new paradigm to design ultracompact optical elements that show great potentials for miniaturizing optical systems. In the past few decades, metasurfaces have drawn broad interests in multidisciplinary communities owing to their capability of manipulating various parameters of the light wave with plentiful functionalities. Among them, pixelated polarization manipulation in the subwavelength scale is a distinguished ability of metasurfaces compared to traditional optical components. However, the inherent ohmic loss of plasmonic-type metasurfaces severely hinders their broad applications due to the low efficiency. Therefore, metasurfaces composed of high-refractive-index all-dielectric antennas have been proposed to achieve high-efficiency devices. Moreover, anisotropic dielectric nanostructures have been shown to support large refractive index contrast between orthogonal polarizations of light and thus provide an ideal platform for polarization manipulation. Herein, we present a review of recent progress on all-dielectric metasurfaces for polarization manipulation, including principles and emerging applications. We believe that high efficient all-dielectric metasurfaces with the unprecedented capability of the polarization control can be widely applied in areas of polarization detection and imaging, data encryption, display, optical communication and quantum optics to realize ultracompact and miniaturized optical systems.

Purcell effect for active tuning of light scattering from semiconductor optical antennas

Science ◽  
2017 ◽  
Vol 358 (6369) ◽  
pp. 1407-1410 ◽  
Author(s):  
Aaron L. Holsteen ◽  
Søren Raza ◽  
Pengyu Fan ◽  
Pieter G. Kik ◽  
Mark L. Brongersma
Keyword(s):  
Refractive Index ◽  
Silicon Nanowires ◽  
Complex Refractive Index ◽  
Strong Dependence ◽  
Visible Spectrum ◽  
Resonant Scattering ◽  
High Refractive Index ◽  
Optical Antennas ◽  
Entire Visible Spectrum ◽  
Magnetic Resonances

Subwavelength, high–refractive index semiconductor nanostructures support optical resonances that endow them with valuable antenna functions. Control over the intrinsic properties, including their complex refractive index, size, and geometry, has been used to manipulate fundamental light absorption, scattering, and emission processes in nanostructured optoelectronic devices. In this study, we harness the electric and magnetic resonances of such antennas to achieve a very strong dependence of the optical properties on the external environment. Specifically, we illustrate how the resonant scattering wavelength of single silicon nanowires is tunable across the entire visible spectrum by simply moving the height of the nanowires above a metallic mirror. We apply this concept by using a nanoelectromechanical platform to demonstrate active tuning.

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