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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Published on: April 4, 2017

Efficient apertureless scanning probes using patterned plasmonic surfaces.

Youngkyu Lee¹, Andrea Alu, John X J Zhang

¹Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, USA. youngkyu.lee@mail.utexas.edu

|January 26, 2012

Summary

This summary is machine-generated.

We developed new apertureless plasmonic probes for near-field scanning optical microscopy (NSOM). These probes significantly enhance optical power throughput and near-field signals, improving microscopy performance.

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Area of Science:

Plasmonics
Nanophotonics
Optical Microscopy

Background:

Near-field scanning optical microscopy (NSOM) traditionally faces limitations in optical power throughput.
Apertureless probes offer high resolution but often struggle with signal intensity.

Purpose of the Study:

To design novel apertureless plasmonic probes for NSOM with enhanced optical power throughput and near-field enhancement.
To combine unidirectional surface plasmon polariton (SPP) generation with nanofocusing for improved probe performance.

Main Methods:

Investigated key design parameters: nanoslit width, nanogroove pitch for unidirectional SPP excitation, and pyramidal geometry for SPP focusing.
Utilized 2D analysis to determine optimal design parameters.
Proposed two realistic probe geometries with patterned plasmonic surfaces based on optimized designs.

Main Results:

Designed probes achieve a full width at half maximum (FWHM) of approximately 150nm, comparable to conventional NSOM designs.
Demonstrated over 3 orders of magnitude larger field enhancement compared to conventional single-aperture probes.
Maintained spatial resolution without degradation.

Conclusions:

The novel probe design effectively combines the high resolution of apertureless probes with significantly improved throughput levels.
This advancement surpasses the performance of even aperture-based NSOM devices.
Offers a promising solution for enhanced near-field optical microscopy applications.