(38-4) 08 * << * >> * Russian * English * Content * All Issues
Nanofocusing by sharp edges
S.A. Degtyarev, A.V. Ustinov, S.N. Khonina
Samara State Aerospace University,
Image Processing Systems Institute, Russian Academy of Sciences
PDF, 465 kB
Full text of article: Russian language.
We show that the near-field nanofocusing of the electromagnetic field is possible to implement not only by means of metallic but also dielectric structures with sharp edges. The effect of the extraordinary enhancement of the longitudinal electric field component near the sharp edges of an optical element microrelief is shown using vector Rayleigh-Sommerfeld integrals. A finite element method is used for modeling the diffraction of the electromagnetic radiation by the edges of high-refractive-index metal and dielectric structures. It is shown that the focal spot size (full width at half-maximum) depends on the radius of curvature of the sharp tip. An optical scheme for sharp focusing, which consists of a concentrator collecting and directing the radiation onto a nano-focuser, is offered. A refractive axicon is suggested as the concentrator that directs the radiation on its vertex where an aluminium or silicon nanosphere is located (a nanofocuser). Illumination of this focuser by an optical vortex beam provides the nanofocusing with high diffraction efficiency. It is necessary to illuminate an axicon by a vortex beam of the first order or by a radially polarized beam. The scheme proposed is able to confine the radiation within a light spot of size l/400 at the half maximum of the intensity.
micro-optics, subwavelength structures, singular optics, nanofocusing, "lighting-rod" effect, finite element method.
Degtyarev SA, Ustinov AV, Khonina SN. Nanofocusing by sharp edges. Computer Optics 2014; 38(4): 629-637. DOI: 10.18287/0134-2452-2014-38-4-629-637.
- Chen, W. Numerical study of an apertureless near field scanning optical microscope probe under radial polarization illumination / W. Chen, Q. Zhan // Optics Express. – 2007. – Vol. 15(7). – P. 4106.
- Wang, J. Development and prospect of near-field optical measurements and characterizations / J. Wang, Q. Wang, M. Zhang // Frontiers of Optoelectronics. – 2007. – Vol. 5(2). – P. 171-181.
- Nalimov, A. Hyperbolic secant slit lens for subwavelength focusing of light / A. Nalimov, V. Kotlyar // Optics Letters. – 2013. – Vol. 38(15). – P. 2702-2704.
- Gramotnev, D.K. Nanofocusing of electromagnetic radiation / D.K. Gramotnev, S.I. Bozhevolnyi // Nature Photonics. – 2014. – Vol. 8. – P. 14-23.
- Novotny, L. Near-field imaging using metal tips illuminated by higher-order Hermite-Gaussian beams / L. Novotny, E.J. Sanchez, X.S. Xie // Ultramicroscopy. – 1998. – Vol. 71. – P. 21-29.
- Zhang, J. Nanostructures for surface plasmons / J. Zhang, L. Zhang // Advances in Optics and Photonics. – 2012. – Vol. 4(2). – P. 157-321.
- Ermushev, A.V. Surface enhancement of local optical effects and "lightning-rod" effect / A.V. Ermushev, B.V. Mchedlishvili, V.A. Oleinikov, A.V. Petukhov // Quantum Electronics. – 1993. – Vol. 23, N 5. – P. 435-440.
- Khonina, S.N. Controlling the contribution of the electric ?eld components to the focus of a high-aperture lens using binary phase structures / S.N. Khonina, S.G. Volotovsky // Journal of the Optical Society of America A. – 2010. – Vol. 27(10). – P. 2188-2197.
- Khonina, S.N. Diffraction of laser beam on a two-zone cylindrical microelement / S.N. Khonina, D.A. Savelyev, A.V. Ustinov // Computer Optics. – 2013. – Vol. 37(2). – P. 160-169. – (In Russian).
- Degtyarev, S.A. Study of subwavelength localization of a radiation by forming closely spaced singular lines using of subwavelength features of the dielectric micro-relief / S.A. Degtyarev, S.N. Khonina // Computer Optics. – 2013. – Vol. 37(4). – P. 426-430. – (In Russian).
- Bezus E.A. Evanescent-wave interferometric nanoscale photolithography using guided-mode resonant gratings / E.A. Bezus, L.L. Doskolovich, N.L. Kazanskiy // Microelectronic Engineering, – 2011. – Vol. 88(2). – P. 170–174.
- Bezus E.A. Interference pattern formation in evanescent electromagnetic waves using waveguide diffraction gratings / E.A. Bezus, L.L. Doskolovich, N.L. Kazanskiy // Quantum Electronics, – 2011. – Vol. 41(8). – P. 759-764. – DOI: 10.1070/QE2011v041n08ABEH014500.) – (In Russian).
- Ustinov, A.V. Analysis of flat beam diffraction by divergent fracxicon in nonparaxial mode / A.V. Ustinov, S.N. Khonina // Computer Optics. – 2014. – Vol. 38(1). – P. 42-50.
- Alferov, S.V. Study of polarization properties of fiber-optics probes with use of a binary phase plate / S.V. Alferov, S.N. Khonina, S.V. Karpeev // Journal of the Optical Society of America A. – 2014. – Vol. 31(4). – P. 802-807.
- Khonina, S.N. High-aperture binary axicons for the formation of the longitudinal electric field component on the optical axis for linear and circular polarizations of the illuminating beam / S.N. Khonina and D.A. Savelyev // Journal of Experimental and Theoretical Physics. – 2013. – Vol. 117, N 4. – P. 623-630.
- Musa, S.M. Computational Finite Element Methods in Nanotechnology. CRC Press, 2012. — 640 p.
- Handbook of Optical Constants of Solids / ed. by E.D. Palik. – Academic, 1998.
- Ustinov, A.V. Calculating the complex transmission function of refractive axicons / A.V. Ustinov and S.N. Khonina, // Optical Memory and Neural Networks (Information Optics). – 2012. – Vol. 21(3). – P. 133-144.
- Savelyev, D.A. Influence of subwave details of microrelief on the diffraction pattern of Gaussian beams / D.A. Savelyev, S.N. Khonina // The Bulletin of the Samara State Aerospace University. – 2014. – No. 1(43). – P. 275-286. – (In Russian).
© 2009, IPSI RAS
151, Molodogvardeiskaya str., Samara, 443001, Russia; E-mail:firstname.lastname@example.org; Tel: +7 (846) 242-41-24 (Executive secretary), +7 (846) 332-56-22 (Issuing editor), Fax: +7 (846) 332-56-20