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Anti-reflection coa...
Anti-reflection coating design for metallic terahertz meta-materials
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- Pancaldi, Matteo (författare)
- Stockholms universitet,Fysikum,CIC nanoGUNE, Spain
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Freeman, Ryan (författare)
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- Hudl, Matthias (författare)
- Stockholms universitet,Fysikum
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Hoffmann, Matthias C. (författare)
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Urazhdin, Sergei (författare)
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Vavassori, Paolo (författare)
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- Bonetti, Stefano (författare)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- 2018
- 2018
- Engelska.
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Ingår i: Optics Express. - 1094-4087. ; 26:3, s. 2917-2927
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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