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Highly ordered laser imprinted plasmonic metasurfaces for polarization sensitive perfect absorption.
Anna C Tasolamprou1, Evangelos Skoulas2, George Perrakis2
1Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas, N. Plastira 100, Crete, 71110, Heraklion, Greece. atasolam@iesl.foth.gr.
Scientific Reports
|November 17, 2022
Summary
We developed novel polarization-sensitive plasmonic metasurfaces using pulsed laser technology. These metasurfaces enable tunable polarization control and high extinction ratios for near- and mid-infrared light.
Area of Science:
- Plasmonics
- Metamaterials
- Nanotechnology
Background:
- Surface plasmon resonance (SPR) is crucial for optical sensing and manipulation.
- Existing fabrication methods for plasmonic metasurfaces can be complex and costly.
- Developing versatile and direct fabrication techniques is essential for advancing metasurface applications.
Purpose of the Study:
- To present a novel, direct fabrication method for polarization-sensitive gap surface plasmon metasurfaces using pulsed laser light.
- To demonstrate the tunability of polarization control by varying the insulating cavity's size and material.
- To achieve high extinction ratios for polarization control in the near- and mid-infrared spectral regions.
Main Methods:
- Fabrication of metasurfaces via laser-induced periodic surface structures on nanometer-thick nickel (Ni) films.
- Construction of a metal-insulator-metal (MIM) structure with TiO2 and ZnO dielectric layers, followed by gold (Au) evaporation.
- Characterization using Fourier-transform infrared (FTIR) spectroscopy to analyze resonant absorption and polarization sensitivity.
Main Results:
- Successful creation of metal-insulator-metal plasmonic metasurfaces with highly-ordered, sinusoidal metallic nanowires.
- Demonstration of sharp, resonant gap surface plasmons enabling polarization control in reflection.
- Observation of polarization-sensitive perfect absorption and high extinction ratios in the near- and mid-IR.
- Experimental validation of well-defined, controllable, and sharp resonances with polarization-sensitive absorption response.
Conclusions:
- Pulsed laser direct material processing offers a versatile alternative for fabricating advanced plasmonic metasurfaces.
- The developed metasurfaces exhibit significant polarization control capabilities, tunable via the insulating cavity.
- These findings pave the way for novel optical devices with tailored polarization responses in the infrared spectrum.
