Anti-reflection coating design for metallic terahertz meta-materials
Abstract
We demonstrate a silicon-based, single-layer anti-reflection coating that suppresses the reflectivity of metals at near-infrared frequencies, enabling optical probing of nano-scale structures embedded in highly reflective surroundings. Our design does not affect the interaction of terahertz radiation with metallic structures that can be used to achieve terahertz near-field enhancement. We have verified the functionality of the design by calculating and measuring the reflectivity of both infrared and terahertz radiation from a silicon/gold double layer as a function of the silicon thickness. We have also fabricated the unit cell of a terahertz meta-material, a dipole antenna comprising two 20-nm thick extended gold plates separated by a 2 μm gap, where the terahertz field is locally enhanced. We used the time-domain finite element method to demonstrate that such near-field enhancement is preserved in the presence of the anti-reflection coating. Finally, we performed magneto-optical Kerr effect measurements on a single 3-nm thick, 1-μm wide magnetic wire placed in the gap of such a dipole antenna. The wire only occupies 2% of the area probed by the laser beam, but its magneto-optical response can be clearly detected. Our design paves the way for ultrafast time-resolved studies, using table-top femtosecond near-infrared lasers, of dynamics inmore »
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Swedish Research Council (SRC); European Research Council (ERC); European Union Programme; Spanish Ministry of Economy, Industry and Competitiveness; National Science Foundation (NSF)
- OSTI Identifier:
- 1418183
- Alternate Identifier(s):
- OSTI ID: 1426160
- Grant/Contract Number:
- 2015-SLAC-100238-Funding; AC02-76SF00515; 600398s; 715452; 737093; MDM-2016-0618; DMR-1504449; ECCS-1509794; E0635001
- Resource Type:
- Published Article
- Journal Name:
- Optics Express
- Additional Journal Information:
- Journal Name: Optics Express Journal Volume: 26 Journal Issue: 3; Journal ID: ISSN 1094-4087
- Publisher:
- Optical Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Spectroscopy, terahertz; Femtosecond phenomena; Metamaterials; Magneto-optical materials
Citation Formats
Pancaldi, Matteo, Freeman, Ryan, Hudl, Matthias, Hoffmann, Matthias C., Urazhdin, Sergei, Vavassori, Paolo, and Bonetti, Stefano. Anti-reflection coating design for metallic terahertz meta-materials. United States: N. p., 2018.
Web. doi:10.1364/OE.26.002917.
Pancaldi, Matteo, Freeman, Ryan, Hudl, Matthias, Hoffmann, Matthias C., Urazhdin, Sergei, Vavassori, Paolo, & Bonetti, Stefano. Anti-reflection coating design for metallic terahertz meta-materials. United States. https://doi.org/10.1364/OE.26.002917
Pancaldi, Matteo, Freeman, Ryan, Hudl, Matthias, Hoffmann, Matthias C., Urazhdin, Sergei, Vavassori, Paolo, and Bonetti, Stefano. Fri .
"Anti-reflection coating design for metallic terahertz meta-materials". United States. https://doi.org/10.1364/OE.26.002917.
@article{osti_1418183,
title = {Anti-reflection coating design for metallic terahertz meta-materials},
author = {Pancaldi, Matteo and Freeman, Ryan and Hudl, Matthias and Hoffmann, Matthias C. and Urazhdin, Sergei and Vavassori, Paolo and Bonetti, Stefano},
abstractNote = {We demonstrate a silicon-based, single-layer anti-reflection coating that suppresses the reflectivity of metals at near-infrared frequencies, enabling optical probing of nano-scale structures embedded in highly reflective surroundings. Our design does not affect the interaction of terahertz radiation with metallic structures that can be used to achieve terahertz near-field enhancement. We have verified the functionality of the design by calculating and measuring the reflectivity of both infrared and terahertz radiation from a silicon/gold double layer as a function of the silicon thickness. We have also fabricated the unit cell of a terahertz meta-material, a dipole antenna comprising two 20-nm thick extended gold plates separated by a 2 μm gap, where the terahertz field is locally enhanced. We used the time-domain finite element method to demonstrate that such near-field enhancement is preserved in the presence of the anti-reflection coating. Finally, we performed magneto-optical Kerr effect measurements on a single 3-nm thick, 1-μm wide magnetic wire placed in the gap of such a dipole antenna. The wire only occupies 2% of the area probed by the laser beam, but its magneto-optical response can be clearly detected. Our design paves the way for ultrafast time-resolved studies, using table-top femtosecond near-infrared lasers, of dynamics in nano-structures driven by strong terahertz radiation.},
doi = {10.1364/OE.26.002917},
journal = {Optics Express},
number = 3,
volume = 26,
place = {United States},
year = {2018},
month = {1}
}
https://doi.org/10.1364/OE.26.002917
Web of Science
Figures / Tables:

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Works referencing / citing this record:
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