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Issue 36, 2018
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High-Q, low-mode-volume and multiresonant plasmonic nanoslit cavities fabricated by helium ion milling

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Abstract

Helium ion milling of chemically-synthesized micron-sized gold flakes is performed to fabricate ultra-narrow nanoslit cavities with a varying length and width down to 5 nm. Their plasmon resonances are characterized by one-photon photoluminescence spectroscopy. The combination of fabrication based on single-crystalline gold and resonant modes with low radiative losses leads to remarkably high quality factors of up to 24. Multiple Fabry–Pérot-type resonances in the visible/near infrared spectral range are observed due to the achieved narrow slit widths and the resulting short effective wavelengths of nanoslit plasmons. These features make nanoslit cavities attractive for a range of applications such as surface-enhanced spectroscopy, ultrafast nano-optics and strong light–matter coupling.

Graphical abstract: High-Q, low-mode-volume and multiresonant plasmonic nanoslit cavities fabricated by helium ion milling

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Article information


Submitted
15 Mar 2018
Accepted
13 Aug 2018
First published
14 Aug 2018

Nanoscale, 2018,10, 17148-17155
Article type
Paper

High-Q, low-mode-volume and multiresonant plasmonic nanoslit cavities fabricated by helium ion milling

K. Chen, G. Razinskas, H. Vieker, H. Gross, X. Wu, A. Beyer, A. Gölzhäuser and B. Hecht, Nanoscale, 2018, 10, 17148
DOI: 10.1039/C8NR02160K

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