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Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

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Chirality-independent plasmon damping at nanoparticle interfaces.

Zengxian Tang, Xiaobo Li, Shihao Lin

|August 2, 2025

Summary

Chemical interface damping (CID) in plasmonics is independent of molecular chirality. Studies on L/D-cysteine enantiomers on gold nanorods show electron transfer dominates, overshadowing chirality effects in biosensor design.

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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

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Published on: September 27, 2011

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Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy

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Published on: June 5, 2019

Area of Science:

Plasmonics and Nanophotonics
Surface Chemistry
Biophysical Chemistry

Background:

Chemical interface damping (CID) is a critical plasmon decay mechanism in plasmonic systems.
Understanding CID's interplay with chiral molecular adsorption is vital for advanced spectroscopic techniques and biosensors.
Small biomolecules on plasmonic nanoparticles present unique challenges for studying CID.

Purpose of the Study:

To systematically investigate the influence of molecular chirality on Chemical Interface Damping (CID).
To elucidate the mechanistic interplay between chiral adsorption and CID on plasmonic nanoparticles.
To determine the dominant factors modulating CID in metal nanoparticle-biomolecule systems.

Main Methods:

Single-particle dark-field spectroscopy was employed to monitor CID responses.
Experiments focused on L/D-cysteine enantiomers adsorbed onto gold nanorods.
Density functional theory (DFT) calculations were performed to analyze interfacial interactions.

Main Results:

L-cysteine and D-cysteine enantiomers exhibited nearly identical adsorption kinetics and CID variations.
DFT identified competing mechanisms: enantiomer-specific dipole moments and chirality-insensitive electron redistribution.
Electron transfer at the gold-molecule interface was found to be the dominant factor in CID modulation.

Conclusions:

CID modulation in this system is primarily driven by electron transfer, not molecular chirality.
The intrinsic electronic effects dominate over weaker dipolar effects related to chirality.
CID is an intrinsic process independent of molecular chirality for gold nanoparticle-cysteine systems.