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Ultimate terahertz field enhancement of single nanoslits

Title
Ultimate terahertz field enhancement of single nanoslits
Author
전형탁
Keywords
RAMAN-SCATTERING; QUANTUM PLASMONICS; MOLECULES; NANOGAP; GAPS; NANOPARTICLES; NANOANTENNAS; TRANSITION; APERTURES; WAVES
Issue Date
2017-02
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v. 95, no. 7, Article no. 075424
Abstract
A single metallic slit is the simplest plasmonic structure for basic physical understanding of electromagnetic field confinement. By reducing the gap size, the field enhancement is expected to first go up and then go down when the gap width becomes subnanometer because of the quantum tunneling effects. A fundamental question is whether we reach the classical limit of field enhancement before entering the quantum regime, i.e., whether the quantum effects undercut the highest field enhancement classically possible. Here, by performing terahertz time domain spectroscopy on single slits of widths varying from 1.5 nm to 50 mu m, we show that ultimate field enhancement determined by the wavelength of light and film thickness can be reached before we hit the quantum regime. Our paper paves way toward designing a quantum plasmonic system with maximum control yet without sacrificing the classical field enhancements.
URI
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.075424http://repository.hanyang.ac.kr/handle/20.500.11754/112691
ISSN
2469-9950; 2469-9969
DOI
10.1103/PhysRevB.95.075424
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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