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Interferometric Plasmonic Lensing with Nanohole Arrays.

Yu Gong¹, Alan G Joly¹, Patrick Z El-Khoury¹

¹Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States.

The Journal of Physical Chemistry Letters

|August 15, 2015

Summary

Researchers mapped surface plasmons using nonlinear photoemission electron microscopy (PEEM) on nanohole arrays. They optimized array geometry for efficient light coupling and plasmonic lensing, enhancing photoemission from gold nanostructures.

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Area of Science:

Plasmonics
Nanophotonics
Surface Science

Background:

Nonlinear photoemission electron microscopy (PEEM) is a powerful technique for probing nanoscale optical phenomena.
Surface plasmon polaritons (SPPs) are collective electron oscillations on metal surfaces that can confine and guide light at the nanoscale.
Nanohole arrays offer a versatile platform for manipulating SPPs through interference effects.

Purpose of the Study:

To map propagating surface plasmons (PSPs) in nanohole arrays using PEEM.
To investigate the influence of nanohole array geometry on PSP interference patterns and photoemission intensity.
To demonstrate interferometric plasmonic lensing for enhanced light focusing and photoemission.

Main Methods:

Utilizing nonlinear PEEM with ultrashort laser pulses (sub-15 fs, 780 nm) at low angle of incidence.

Keywords:

nanohole array nonlinear microscopy photoemission electron microscopy plasmonic focusing

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Fabricating gold nanohole arrays with controlled geometric parameters (diameter, pitch, arrangement).

Performing finite-difference time-domain (FDTD) simulations to model PSP propagation and interference.

Main Results:

Observed strong near-field photoemission patterns attributed to constructive and destructive interference of PSPs.
Demonstrated that varying array geometry (hole size, pitch, number of rows/columns) leads to intense localized photoemission.
Identified optimal array geometries for efficient light coupling and interferometric plasmonic lensing.

Conclusions:

Nanohole arrays enable precise control over PSP interference for tailored light-matter interactions.
Interferometric plasmonic lensing using nanohole arrays can significantly enhance localized photoemission.
This approach has potential applications in nanoscale imaging and spectroscopy, as shown by enhancing photoemission from a gold triangle vertex.