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Sci Rep. 2019 Dec 24;9(1):19750. doi: 10.1038/s41598-019-56077-8.

Plasmonic Nanolenses Produced by Cylindrical Vector Beam Printing for Sensing Applications.

Scientific reports

S A Syubaev, A Yu Zhizhchenko, D V Pavlov, S O Gurbatov, E V Pustovalov, A P Porfirev, S N Khonina, S A Kulinich, J B B Rayappan, S I Kudryashov, A A Kuchmizhak

Affiliations

  1. Far Eastern Federal University, Vladivostok, Russia.
  2. Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia.
  3. Samara National Research University, Samara, Russia.
  4. IPSI RAS - Branch of the FSRC "Crystallography and Photonics" RAS, Samara, Russia.
  5. Department of Mechanical Engineering, Tokai University, Hiratsuka, Kanagawa, Japan.
  6. School of Electrical and Electronics Engineering, SASTRA Deemed University, Thanjavur, Tamil Nadu, India.
  7. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia.
  8. National Research Nuclear University MEPhI, Moscow, Russia.
  9. Far Eastern Federal University, Vladivostok, Russia. [email protected].
  10. Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia. [email protected].

PMID: 31874984 PMCID: PMC6930225 DOI: 10.1038/s41598-019-56077-8

Abstract

Interaction of complex-shaped light fields with specially designed plasmonic nanostructures gives rise to various intriguing optical phenomena like nanofocusing of surface waves, enhanced nonlinear optical response and appearance of specific low-loss modes, which can not be excited with ordinary Gaussian-shaped beams. Related complex-shaped nanostructures are commonly fabricated using rather expensive and time-consuming electron- and ion-beam lithography techniques limiting real-life applicability of such an approach. In this respect, plasmonic nanostructures designed to benefit from their excitation with complex-shaped light fields, as well as high-performing techniques allowing inexpensive and flexible fabrication of such structures, are of great demand for various applications. Here, we demonstrate a simple direct maskless laser-based approach for fabrication of back-reflector-coupled plasmonic nanorings arrays. The approach is based on delicate ablation of an upper metal film of a metal-insulator-metal (MIM) sandwich with donut-shaped laser pulses followed by argon ion-beam polishing. After being excited with a radially polarized beam, the MIM configuration of the nanorings permitted to realize efficient nanofocusing of constructively interfering plasmonic waves excited in the gap area between the nanoring and back-reflector mirror. For optimized MIM geometry excited by radially polarized CVB, substantial enhancement of the electromagnetic near-fields at the center of the ring within a single focal spot with the size of 0.37λ

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