Reversal in axial symmetry of nonlinear optical trapping potential for metallic nanoparticles: generalized Lorenz-Mie theory

2020 ◽  
Author(s):  
Sumit Yadav ◽  
Anita Devi ◽  
Arijit K. De
Keyword(s):  
Axial Symmetry ◽  
Metallic Nanoparticles ◽  
Nonlinear Optical ◽  
Optical Trapping ◽  
Mie Theory ◽  
Trapping Potential

Linear and Nonlinear Optical Phenomena of Metallic Nanoparticles

2008 ◽  
Vol 14 (6) ◽  
pp. 1540-1551 ◽  
Author(s):  
M. Haraguchi ◽  
T. Okamoto ◽  
T. Inoue ◽  
M. Nakagaki ◽  
H. Koizumi ◽  
...  
Keyword(s):  
Metallic Nanoparticles ◽  
Nonlinear Optical ◽  
Linear And Nonlinear ◽  
Optical Phenomena ◽  
Nonlinear Optical Phenomena

Thiacarbocyanine dye J-aggregation in optical trapping potential

2006 ◽  
Author(s):  
Yoshito Tanaka ◽  
Hiroyuki Yoshikawa ◽  
Hiroshi Masuhara
Keyword(s):  
Optical Trapping ◽  
Trapping Potential

Properties of Different Nano-Metallic Particles in Optical Trapping

2010 ◽  
Vol 663-665 ◽  
pp. 425-428
Author(s):  
Yu Heng Zhang ◽  
Yin An Fang ◽  
Duan Zheng Yao
Keyword(s):  
Copper Nanoparticles ◽  
Metallic Nanoparticles ◽  
Optical Trapping ◽  
Power Spectra ◽  
Potential Well ◽  
Metallic Particles ◽  
Gold Silver ◽  
Calculation Results ◽  
Gradient Forces ◽  
The Stability

Metal nanoparticles are well-known to exhibit a strong interaction with light, which have very important applications and one of them, recent years, is optical trapping of the metallic nanoparticles. Based on the principle of the optical trapping for metallic nanoparticles, in this paper, the gradient forces and the scattering forces in the optical trapping for gold-, silver- and copper-nanoparticles have been analyzed and calculated numerically. Typical power spectra for gold-, silver- and copper-nanoparticles have been obtained. It is shown from the calculation results that under what condition these metallic nanoparticles can be trapped, and the stability of the potential well for these metallic nanoparticles has been analyzed in order to know whether the well was deep enough for overcoming the gravity and Brownian motion.

scholarly journals Laser additive processing for nano/micro-structure based on optical trapping potential

2020 ◽  
Vol 2020 (0) ◽  
pp. S13201
Author(s):  
Masaki MICHIHATA ◽  
Makoto YOKEI ◽  
Shotaro KADOYA ◽  
Kiyoshi TAKAMASU ◽  
Satoru TAKAHASHI
Keyword(s):  
Optical Trapping ◽  
Trapping Potential ◽  
Micro Structure

scholarly journals Computational Modelling for the Optical Properties of Dye Molecules Adsorbed onto Metallic Nanoparticles

2021 ◽  
Author(s):  
Chhayly Tang
Keyword(s):  
Optical Properties ◽  
Shell Model ◽  
Plasmon Resonance ◽  
Metallic Nanoparticles ◽  
Maxwell's Equations ◽  
Mie Theory ◽  
Effective Medium ◽  
Dye Molecules ◽  
Effective Medium Model ◽  
Medium Model

<p><b>The study of light scattering by particles has become fundamental and applied interests in the fields of chemistry, biology, and most importantly in physics. In this context, this thesis focuses on understanding the optical properties of dye layers adsorbed onto metallic nanoparticles (NP), which is essential for interpreting the results of plasmon-dye coupling experiments. To model such a system, Mie theory is often used to solve for the exact solution to Maxwell’s equations for spherical homogeneous and isotropic coated NP. The effects of the NP’s plasmon resonances on the optical properties of the adsorbed dye layer have been predicted using an effective medium model, where the dye-layer is treated as an isotropic layer with an effective dielectric function accounting for the dye resonance. However, this isotropic shell model is inadequate as it cannot account for the dye surface concentration and the anisotropy of the optical response of the dye layer.</b></p> <p>In this thesis, we introduce anisotropic effects within Mie theory and develop microscopic models to define effective dielectric functions which explicitly include the dye-concentration effect in the shell model. Combining anisotropic Mie theory with a concentration-dependent effective shell model allows us to form new theoretical tools to model the optical properties of adsorbed dye layers on metallic NPs of spherical shape. With this new refined effective medium model, we are then able to study shell models for elongated particles beyond the quasi-static approximation. This is implemented using the finite element method (FEM) to numerically solve Maxwell’s equations. The FEM implementation is then used to investigate how the NP’s plasmon resonance can be affected by the dye’s orientation and location on the NP’s surface. We show that the orientation and location of the dye molecules on the NP determine how strongly the plasmon resonance is shifted.</p> <p>The results of this work will improve our ability to accurately model the optical properties of anisotropic molecules adsorbed on metallic NPs. This is important in a number of applications including the development of localised surface plasmon resonance (LSPR) sensing and the design of plasmonic devices.</p>

scholarly journals Deciphering single- and multi-particle trapping dynamics under femtosecond pulsed excitation with simultaneous spatial and temporal resolution

2022 ◽  
Author(s):  
Anita Devi ◽  
Sumit Yadav ◽  
Arijit De
Keyword(s):  
Temporal Resolution ◽  
Nonlinear Optical ◽  
Optical Trapping ◽  
Experimental Studies ◽  
Video Microscopy ◽  
Experimental Results ◽  
Particle Trapping ◽  
Pulsed Excitation ◽  
Shed Light ◽  
Confocal Detection

Abstract Recent theoretical and experimental studies have shed light on how optical trapping dynamics under femtosecond pulsed excitation are fine-tuned by optical and thermal nonlinearities. Here, we present experimental results of nonlinear optical trapping of single and multiple polystyrene beads (of 1 μm diameter). We show how integration and synchronization of bright-filed video microscopy with confocal detection of backscatter provide both spatial and temporal resolution required to capture intricate details of trapping dynamics. Such spatiotemporal detection is promising to have far-reaching applications in exploring controlled optical trapping and manipulations harnessed by optical and thermal nonlinearities.

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