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Angstrom-Scale Active Width Control of Nano Slits for Variable Plasmonic Cavity
Dukhyung Lee1, Dohee Lee1, Hyeong Seok Yun1
1Department of Physics and Center for Atom Scale Electromagnetism, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea.
Nanomaterials (Basel, Switzerland)
|September 28, 2021
Summary
Flexible substrates enable active tuning of nanogap plasmonic cavities. Bending a polydimethylsiloxane (PDMS) substrate precisely controls nanogap width, altering optical properties for quantum plasmonics applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Nanogap slits function as plasmonic Fabry-Perot cavities, crucial for visible and infrared light manipulation.
- Tuning nanogap width is vital for controlling plasmonic cavity properties, but wafer-scale active tuning remains a challenge.
Purpose of the Study:
- Investigate structural deformation and optical property changes in nanogap slit arrays on bent flexible substrates.
- Explore the potential of flexible substrates for active width control of plasmonic cavities.
Main Methods:
- Finite Element Method (FEM) simulations were employed to model nanogap slit arrays on outer bent polydimethylsiloxane (PDMS) substrates.
- Analyzed the correlation between substrate curvature, gap width, and optical properties.
Main Results:
- Tensile deformation concentrates at the gap bottom, widening the nanogap proportionally to substrate curvature.
- Gap widening causes a resonance blueshift and a decrease in field enhancement.
- A low displacement ratio (10^-5) enables angstrom-scale width control, comparable to mechanically controllable break junctions.
Conclusions:
- Nanogap slits on flexible substrates offer a viable method for active plasmonic cavity tuning.
- The demonstrated angstrom-scale width control highlights significant potential for applications in quantum plasmonics.
