scholarly journals Plasmonic elliptical nanoholes for chiroptical analysis and enantioselective optical trapping

Nanoscale ◽  
2021 ◽  
Author(s):  
Zhan-Hong Lin ◽  
Jiwei Zhang ◽  
Jer-Shing Huang
Keyword(s):  
Optical Trapping ◽  
Near Field ◽  
Trapping Force ◽  
Linearly Polarized

Under linearly polarized illumination, a well-designed elliptical nanohole concurrently offers chiral near field and enantioselective optical trapping force to attract/repel the chiral target.

scholarly journals Plasmonic interference modulation for broadband nanofocusing

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shaobo Li ◽  
Shuming Yang ◽  
Fei Wang ◽  
Qiang Liu ◽  
Biyao Cheng ◽  
...  
Keyword(s):  
Near Field ◽  
Three Dimensional ◽  
Field Enhancement ◽  
Incident Beam ◽  
Plasmonic Mode ◽  
Resonant Structures ◽  
Interference Modulation ◽  
Near Field Imaging ◽  
Linearly Polarized ◽  
Radially Polarized

Abstract Metallic plasmonic probes have been successfully applied in near-field imaging, nanolithography, and Raman enhanced spectroscopy because of their ability to squeeze light into nanoscale and provide significant electric field enhancement. Most of these probes rely on nanometric alignment of incident beam and resonant structures with limited spectral bandwidth. This paper proposes and experimentally demonstrates an asymmetric fiber tip for broadband interference nanofocusing within its full optical wavelengths (500–800 nm) at the nanotip with 10 nm apex. The asymmetric geometry consisting of two semicircular slits rotates plasmonic polarization and converts the linearly polarized plasmonic mode to the radially polarized plasmonic mode when the linearly polarized beam couples to the optical fiber. The three-dimensional plasmonic modulation induces circumference interference and nanofocus of surface plasmons, which is significantly different from the nanofocusing through plasmon propagation and plasmon evolution. The plasmonic interference modulation provides fundamental insights into the plasmon engineering and has important applications in plasmon nanophotonic technologies.

Photocatalytic nano-optical trapping using TiO2 nanosphere pairs mediated with Mie-scattered near field

2013 ◽  
Vol 111 (1) ◽  
pp. 117-126
Author(s):  
Toshiyuki Honda ◽  
Mitsuhiro Terakawa ◽  
Minoru Obara
Keyword(s):  
Optical Trapping ◽  
Near Field

Fast and numerically stable Mie solution of EM near field and absorption for stratified spheres

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Olivér Csernyava ◽  
Bálint Péter Horváth ◽  
Zsolt Badics ◽  
Sándor Bilicz
Keyword(s):  
Near Field ◽  
Human Head ◽  
Approximate Model ◽  
Head Model ◽  
Wave Regime ◽  
Content Type ◽  
Precise Calculation ◽  
Linearly Polarized ◽  
Numerical Instabilities ◽  
Computational Resources

Purpose The purpose of this paper is the development of an analytic computational model for electromagnetic (EM) wave scattering from spherical objects. The main application field is the modeling of electrically large objects, where the standard numerical techniques require huge computational resources. An example is full-wave modeling of the human head in the millimeter-wave regime. Hence, an approximate model or analytical approach is used. Design/methodology/approach The Mie–Debye theorem is used for calculating the EM scattering from a layered dielectric sphere. The evaluation of the analytical expressions involved in the infinite sum has several numerical instabilities, which makes the precise calculation a challenge. The model is validated through an application example with comparing results to numerical calculations (finite element method). The human head model is used with the approximation of a two-layer sphere, where the brain tissues and the cranial bones are represented by homogeneous materials. Findings A significant improvement is introduced for the stable calculation of the Mie coefficients of a core–shell stratified sphere illuminated by a linearly polarized EM plane wave. Using this technique, a semi-analytical expression is derived for the power loss in the sphere resulting in quick and accurate calculations. Originality/value Two methods are introduced in this work with the main objective of estimating the final precision of the results. This is an important aspect for potentially unstable calculations, and the existing implementations have not included this feature so far.

Nanoapertures near field properties and conditions for the nanoparticles optical trapping

2006 ◽  
Author(s):  
Juan Manuel Merlo ◽  
Erwin Martí Panameño ◽  
Luis Arroyo Carrasco
Keyword(s):  
Optical Trapping ◽  
Near Field

Near field transmission lines feed linearly polarized array antenna for built-in test

2005 ◽  
Author(s):  
Shii-Shyong Wang ◽  
Ruey-Shi Chu
Keyword(s):  
Transmission Lines ◽  
Near Field ◽  
Array Antenna ◽  
Linearly Polarized

Measurement of the optical trapping force on micro-particles immersed in fluids

2005 ◽  
Author(s):  
Monica Nadasan ◽  
Revati Kulkarni ◽  
Enrico Ferrari ◽  
Valeria Garbin ◽  
Dan Cojoc ◽  
...  
Keyword(s):  
Optical Trapping ◽  
Micro Particles ◽  
Trapping Force

Orthogonal Nanoparticle Size, Polydispersity, and Stability Characterization with Near-Field Optical Trapping and Light Scattering

ACS Photonics ◽  
2016 ◽  
Vol 4 (1) ◽  
pp. 106-113 ◽  
Author(s):  
Perry Schein ◽  
Dakota O’Dell ◽  
David Erickson
Keyword(s):  
Light Scattering ◽  
Optical Trapping ◽  
Near Field ◽  
Nanoparticle Size

Obtaining Circularly Polarized Optical Spots Beyond the Diffraction Limit Using Plasmonic Nano-Antennas

2009 ◽  
Vol 1208 ◽  
Author(s):  
Erdem Ogut ◽  
Gullu Kiziltas ◽  
Kursat Sendur
Keyword(s):  
Incident Light ◽  
Near Field ◽  
Diffraction Limit ◽  
Polarization Angle ◽  
Circularly Polarized ◽  
All Optical ◽  
Linearly Polarized ◽  
Linearly Polarized Radiation ◽  
Optical Applications ◽  
Polarized Radiation

AbstractWith advances in nanotechnology, emerging plasmonic nano-optical applications, such as all-optical magnetic recording, require circularly-polarized electromagnetic radiation beyond the diffraction limit. In this study, a plasmonic cross-dipole nano-antenna is investigated to obtain a circularly polarized near-field optical spot with a size smaller than the diffraction limit of light. The performance of the nano-antenna is investigated through numerical simulations. In the first part of this study, the nano-antenna is illuminated with a diffraction-limited circularly-polarized radiation to obtain circularly polarized optical spots at nanoscale. In the second part, diffraction limited linearly polarized radiation is used. An optimal configuration for the nano-antenna and the polarization angle of the incident light is identified to obtain a circularly polarized optical spot beyond the diffraction limit from a linearly polarized diffraction limited radiation.

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