Beam focalization in reflection from flat dielectric subwavelength gratings

Anno: 2014

Autori: Cheng Y.C., Zeng H., Trull J., Cojocaru C., Malinauskas M., Jukna T., Wiersma D., Staliunas K.

Affiliazione autori: Departament de Fisica i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Barcelona, 08222, Spain; European Laboratory for Non Linear Spectroscopy (LENS), University of Florence, Sesto Fiorentino, 50019, Italy; Laser Research Center, Department of Quantum Electronics, Vilnius University, Vilnius, LT-10222, Lithuania; Department of Technologies, Panevezys Faculty of Technologies and Business, Kaunas University of Technologies, Panevezys, LT-35212, Lithuania; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, 08010, Spain

Abstract: We experimentally demonstrate the recently predicted effect of near-field focusing for light beams from flat dielectric subwavelength gratings (SWGs). This SWGs were designed for visible light 532 nm and fabricated by direct laser writing in a negative photoresist, with the refractive index n = 1.5 and the period d = 314 nm. The laterally invariant gratings can focus light beams without any optical axis to achieve the transversal invariance. We show that focal distances can be obtained up to 13 µm at normal reflection for TE polarization.

Giornale/Rivista: OPTICS LETTERS

Volume: 39 (20)      Da Pagina: 6086  A: 6089

Maggiori informazioni: We acknowledge funding from Spanish Ministerio de Educacion y Ciencia and European FEDER through project FIS2011-29734-C02-01. Y. C. C. was supported by the Erasmus Mundus Doctorate Program Europhotonics 2011/2014. M. M. and T. J. acknowledge the research support by a grant no. MIP-12241 (“Mikrosviesa”) from the Research Council of Lithuania. H. Z. and D. S. W. have received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. [291349].
Parole chiavi: Sub-wave length grating; Negative refraction; Photonic crystals; Transmission; Laser; Lens
DOI: 10.1364/OL.39.006086

Citazioni: 21
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18
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