scholarly journals Stress‐Induced 3D Chiral Fractal Metasurface for Enhanced and Stabilized Broadband Near‐Field Optical Chirality

2019 ◽  
Vol 7 (15) ◽  
pp. 1900617 ◽  
Author(s):  
Ming Lun Tseng ◽  
Zhan‐Hong Lin ◽  
Hsin Yu Kuo ◽  
Tzu‐Ting Huang ◽  
Yi‐Teng Huang ◽  
...  
Keyword(s):  
Near Field ◽  
Optical Chirality

scholarly journals Enhanced Near-Field Chirality in Periodic Arrays of Si Nanowires for Chiral Sensing

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 853 ◽  
Author(s):  
Emilija Petronijevic ◽  
Concita Sibilia
Keyword(s):  
Near Field ◽  
Chiral Molecule ◽  
Chiral Molecules ◽  
Si Nanowires ◽  
Simple Experiment ◽  
Excitation Scheme ◽  
Periodic Arrays ◽  
Optical Chirality ◽  
Resonant Modes ◽  
Chiral Sensing

Nanomaterials can be specially designed to enhance optical chirality and their interaction with chiral molecules can lead to enhanced enantioselectivity. Here we propose periodic arrays of Si nanowires for the generation of enhanced near-field chirality. Such structures confine the incident electromagnetic field into specific resonant modes, which leads to an increase in local optical chirality. We investigate and optimize near-field chirality with respect to the geometric parameters and excitation scheme. Specially, we propose a simple experiment for the enhanced enantioselectivity, and optimize the average chirality depending on the possible position of the chiral molecule. We believe that such a simple achiral nanowire approach can be functionalized to give enhanced chirality in the spectral range of interest and thus lead to better discrimination of enantiomers.

scholarly journals Local Optical Chirality Induced by Near-Field Mode Interference in Achiral Plasmonic Metamolecules

Nano Letters ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 509-516 ◽  
Author(s):  
Andreas Horrer ◽  
Yinping Zhang ◽  
Davy Gérard ◽  
Jérémie Béal ◽  
Mathieu Kociak ◽  
...  
Keyword(s):  
Near Field ◽  
Field Mode ◽  
Optical Chirality ◽  
Mode Interference

scholarly journals Generating Far-Field Orbital Angular Momenta from Near-Field Optical Chirality

2013 ◽  
Vol 110 (20) ◽  
Author(s):  
Yuri Gorodetski ◽  
Aurélien Drezet ◽  
Cyriaque Genet ◽  
Thomas W. Ebbesen
Keyword(s):  
Near Field ◽  
Far Field ◽  
Angular Momenta ◽  
Optical Chirality

scholarly journals Analytic Optimization of Near-Field Optical Chirality Enhancement

ACS Photonics ◽  
2017 ◽  
Vol 4 (2) ◽  
pp. 396-406 ◽  
Author(s):  
Christian Kramer ◽  
Martin Schäferling ◽  
Thomas Weiss ◽  
Harald Giessen ◽  
Tobias Brixner
Keyword(s):  
Near Field ◽  
Optical Chirality

scholarly journals Non-Absorbing Dielectric Materials for Surface-Enhanced Spectroscopies and Chiral Sensing in the UV

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2078
Author(s):  
Saúl A. Rosales ◽  
Francisco González ◽  
Fernando Moreno ◽  
Yael Gutiérrez
Keyword(s):  
Heat Generation ◽  
Near Field ◽  
Dielectric Materials ◽  
Visible Range ◽  
Metal Nanostructures ◽  
Absorption Bands ◽  
Optical Chirality ◽  
Chiral Sensing ◽  
Magnetic Type ◽  
New Phenomena

Low-loss dielectric nanomaterials are being extensively studied as novel platforms for enhanced light-matter interactions. Dielectric materials are more versatile than metals when nanostructured as they are able to generate simultaneously electric- and magnetic-type resonances. This unique property gives rise to a wide gamut of new phenomena not observed in metal nanostructures such as directional scattering conditions or enhanced optical chirality density. Traditionally studied dielectrics such as Si, Ge or GaP have an operating range constrained to the infrared and/or the visible range. Tuning their resonances up to the UV, where many biological samples of interest exhibit their absorption bands, is not possible due to their increased optical losses via heat generation. Herein, we report a quantitative survey on the UV optical performance of 20 different dielectric nanostructured materials for UV surface light-matter interaction based applications. The near-field intensity and optical chirality density averaged over the surface of the nanoparticles together with the heat generation are studied as figures of merit for this comparative analysis.

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

Principles of Planar Near-Field Antenna Measurements

2007 ◽  
Author(s):  
Stuart Gregson ◽  
John McCormick ◽  
Clive Parini
Keyword(s):  
Near Field ◽  
Antenna Measurements
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