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Open AccessArticle

Deep Subwavelength-Scale Light Focusing and Confinement in Nanohole-Structured Mesoscale Dielectric Spheres

College of Computer Science and Technology, Jilin University, 2699 Qianjin Street, Changchun 130012, China
Changchun Institute of Optics, Fine Mechanics and Physics, 3888 East Nanhu Road, Changchun 130033, China
Radiohpysical Department, Tomsk State University, 30 Lenin Avenue, Tomsk 634050, Russia
Nondestructive Testing School, Tomsk Polytechnic University, 36 Lenin Avenue, Tomsk 634050, Russia
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(2), 186;
Received: 28 December 2018 / Revised: 29 January 2019 / Accepted: 30 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Dynamics and Applications of Photon-Nanostructured Systems)
One of the most captivating properties of dielectric mesoscale particles is their ability to form a sub-diffraction limited-field localization region, near their shadow surfaces. However, the transverse size of the field localization region of a dielectric mesoscale particle is usually larger than λ/3. In this present paper, for the first time, we present numerical simulations to demonstrate that the size of the electromagnetic field that forms in the localized region of the dielectric mesoscale sphere can be significantly reduced by introducing a nanohole structure at its shadow surface, which improves the spatial resolution up to λ/40 and beyond the solid immersion diffraction limit of λ/2n. The proposed nanohole-structured microparticles can be made from common natural optical materials, such as glass, and are important for advancing the particle-lens-based super-resolution technologies, including sub-diffraction imaging, interferometry, surface fabrication, enhanced Raman scattering, nanoparticles synthesis, optical tweezer, etc. View Full-Text
Keywords: nanohole; microsphere; subwavelength-scale light focusing nanohole; microsphere; subwavelength-scale light focusing
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Cao, Y.; Liu, Z.; Minin, O.V.; Minin, I.V. Deep Subwavelength-Scale Light Focusing and Confinement in Nanohole-Structured Mesoscale Dielectric Spheres. Nanomaterials 2019, 9, 186.

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