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Plasmonic quadrant lens for beam-position sensing.

Jiayuan Wang, Jing Yang, Zhenjian Bai

|September 24, 2016

Summary

We designed a plasmonic quadrant lens (QL) that couples light into surface plasmon polaritons (SPPs), focusing it based on polarization. This device acts as a plasmonic quadrant detector for sensitive beam-position sensing.

Area of Science:

Photonics and Nanotechnology
Plasmonics
Optics

Background:

Surface plasmon polaritons (SPPs) enable light manipulation at the nanoscale.
Quadrant detectors are crucial for beam-position sensing.
Integrating plasmonics with detection offers novel functionalities.

Purpose of the Study:

To design and investigate a plasmonic quadrant lens (QL) for coupling free-space light into SPPs.
To demonstrate SPP focusing into multiple directions based on incident light polarization.
To explore the QL's application as a plasmonic beam-position sensor.

Main Methods:

Fabrication of QLs using uniform nanogrooves etched on a gold film.
Numerical simulations to analyze light coupling and SPP focusing.

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Development of a center location algorithm for beam-position sensing.

Investigation of device sensitivity for linear and circular polarized light.

Main Results:

Successful realization of QLs with four and eight foci.
Demonstration of polarization-dependent SPP focusing.
Validation of QLs as plasmonic quadrant detectors.
Four-focus QL shows a large effective detecting area.
Eight-focus QL allows simultaneous sensing with dual sensitivities.

Conclusions:

The plasmonic quadrant lens is a viable device for coupling light into SPPs and focusing it.
QLs can function as plasmonic detectors for precise beam-position sensing.
The design offers flexibility in sensing capabilities, with potential for advanced optical systems.