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|July 2, 2016

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Researchers developed a freestanding bi-periodic array of holes in silver film. This enables a miniaturized tunable quarter-wave plate for enhanced optical transmission and circularly polarized light.

Area of Science:

Photonics and Plasmonics
Optical Metamaterials
Nanophotonics

Background:

Resonant transmission through metallic hole arrays is maximized when surrounding dielectric environments are homogenous.
Refractive index changes significantly influence resonance shifts, offering tuning capabilities.
Extraordinary optical transmission (EOT) through subwavelength structures is a key phenomenon in nanophotonics.

Purpose of the Study:

To propose and demonstrate a freestanding bi-periodic array of holes in a silver film.
To investigate the tunability of optical resonances via environmental refractive index changes.
To realize a miniaturized tunable quarter-wave plate utilizing EOT.

Main Methods:

Fabrication of a freestanding bi-periodic array of holes using a novel technique.

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Published on: July 21, 2018

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Numerical simulations to model optical transmission and mode shifts.

Experimental characterization of the fabricated structure's optical response.

Main Results:

Achieved highest resonant transmission with a homogenous dielectric environment.
Demonstrated significant shifts in (1,0) and (0,1) modes with refractive index variations.
Confirmed experimental realization of a tunable quarter-wave plate operating in EOT mode.

Conclusions:

The proposed freestanding bi-periodic array enables efficient EOT.
Tunable optical responses are achieved by controlling the dielectric environment.
The developed device functions as a high-throughput, miniaturized tunable quarter-wave plate for circularly polarized light.