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Anti-reflection coating design for metallic terahertz meta-materials
Stockholm University, Faculty of Science, Department of Physics. CIC nanoGUNE, Spain.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 72018 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 3, p. 2917-2927Article in journal (Refereed) Published
Abstract [en]

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 mu m 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-mu m 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.

Place, publisher, year, edition, pages
2018. Vol. 26, no 3, p. 2917-2927
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-154599DOI: 10.1364/OE.26.002917ISI: 000425365900069PubMedID: 29401825OAI: oai:DiVA.org:su-154599DiVA, id: diva2:1195372
Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-04-05Bibliographically approved

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