scholarly journals Fundamentals of negative refractive index optical trapping: forces and radiation pressures exerted by focused Gaussian beams using the generalized Lorenz-Mie theory

2010 ◽  
Vol 1 (5) ◽  
pp. 1284 ◽  
Author(s):  
Leonardo A. Ambrosio ◽  
Hugo E. Hernández-Figueroa
Keyword(s):  
Refractive Index ◽  
Optical Trapping ◽  
Negative Refractive Index ◽  
Mie Theory ◽  
Gaussian Beams ◽  
Trapping Forces

scholarly journals Towards non-blind optical tweezing by finding 3D refractive index changes through off-focus interferometric tracking

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Benjamin Landenberger ◽  
Yatish ◽  
Alexander Rohrbach
Keyword(s):  
Refractive Index ◽  
Laser Scanning ◽  
Optical Trapping ◽  
Optical Traps ◽  
Large Specimen ◽  
Biological Specimen ◽  
3D Microscopy ◽  
Index Changes ◽  
Computer Controlled ◽  
Trapping Forces

AbstractIn modern 3D microscopy, holding and orienting arbitrary biological objects with optical forces instead of using coverslips and gel cylinders is still a vision. Although optical trapping forces are strong enough and related photodamage is acceptable, the precise (re-) orientation of large specimen with multiple optical traps is difficult, since they grab blindly at the object and often slip off. Here, we present an approach to localize and track regions with increased refractive index using several holographic optical traps with a single camera in an off-focus position. We estimate the 3D grabbing positions around several trapping foci in parallel through analysis of the beam deformations, which are continuously measured by defocused camera images of cellular structures inside cell clusters. Although non-blind optical trapping is still a vision, this is an important step towards fully computer-controlled orientation and feature-optimized laser scanning of sub-mm sized biological specimen for future 3D light microscopy.

Compact ring resonators using negative-refractive-index microstrip line

2005 ◽  
Vol 45 (4) ◽  
pp. 294-295 ◽  
Author(s):  
Aaron D. Scher ◽  
Christopher T. Rodenbeck ◽  
Kai Chang
Keyword(s):  
Refractive Index ◽  
Microstrip Line ◽  
Negative Refractive Index ◽  
Ring Resonators ◽  
Compact Ring

Determination of pseudo-refractive index in self-assembled ligand layers from spectral shift of surface plasmon resonances in colloidal silver nanoplates

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Pavel Malakhovsky ◽  
Dmitry Murausky ◽  
Dmitry Guzatov ◽  
Sergey Gaponenko ◽  
Mikhail Artemyev
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Mie Theory ◽  
Spectral Shift ◽  
Localized Surface Plasmon ◽  
Clear Trend ◽  
Silver Nanoplates ◽  
Assembled Monolayers ◽  
Self Assembled

Abstract We examined systematically how self-assembled monolayers (SAMs) of different mercaptoacids affect the spectral shift of the localized surface plasmon resonance in silver nanoplates and nanospheres. We observed a clear trend in the magnitude of a redshift with a molecular length or the SAM thickness within a homologous series of aliphatic mercaptoacids: the thicker shell the stronger the red shift. Using classic Mie theory for plasmonic core-dielectric shell spheres and oblate spheroids we developed the method for determination of a pseudo-refractive index in SAM of different molecules and obtained a good correlation with the reference refractive indices for bulk long-chain aliphatic acids, but only in case of silver nanoplates. Calculations for silver core–shell nanospheres gave overestimated values of refractive index perhaps due to restrictions of Mie theory on the minimum particle size.

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