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Title: 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 » nano-structures driven by strong terahertz radiation.« less

Authors:
; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); 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. doi: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. doi: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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.26.002917

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 Fig. 1: Design of the dipole antenna for terahertz near-field enhancement in the gap between two metallic electrodes, covered with an anti-reflection coating for near-infrared and visible radiation. A single-cycle of the terahertz field, with the suitable polarization for the optimal coupling to the antenna, is sketched. The pink arrowsmore » schematically show the working principle of the anti-reflection coating for a metal, where destructive interference (zig-zag arrows within the top layer) is combined with the dielectric losses to compensate for the forbidden transmission through the metallic electrodes (crossed-out arrows in the metal layer), as described in detail in the text.« less

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    Works referencing / citing this record:

    Ultra-broad band antireflection coating at mid wave infrared for high efficient germanium optics
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    • Yenisoy, Adem; Yesilyaprak, Cahit; Ruzgar, Kemal
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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.