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3D laser printing by ultra-short laser pulses for micro-optical applications: towards telecom wavelengths
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Paper Abstract

Three dimensional (3D) fast (< 0.5 hour) printing of micro-optical elements down to sub-wavelength resolution over 100 μm footprint areas using femtosecond (fs-)laser oscillator is presented. Using sub-1 nJ pulse energies, optical vortex generators made of polymerised grating segments with an azimuthally changing orientation have been fabricated in SZ2080 resist; width of polymerised rods was ~ 150 nm and period 0.6-1 μm. Detailed phase retardance analysis was carried out manually with Berek compensator (under a white light illumination) and using an equivalent principle by an automated Abrio implementation at 546 nm. Direct experimental measurements of retardance was required since the period of the grating was comparable (or larger) than the wavelength of visible light. By gold sputtering, transmissive optical vortex generators were turned into reflective ones with augmented retardance, Δn × h defined by the form birefringence, Δn, and the height h = 2d where d is the thickness of the polymerised structure. Retardance reached 315 nm as measured with Berek compensator at visible wavelengths. Birefringent phase delays of π (or λ/2 in wavelength) required for high purity vortex generators can be made based on the proposed approach. Optical vortex generators for telecom wavelengths with sub-wavelength patterns of azimuthally oriented gratings are amenable by direct laser polymerisation.

Paper Details

Date Published: 1 August 2017
PDF: 10 pages
Proc. SPIE 10339, Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers, 1033906 (1 August 2017); doi: 10.1117/12.2270706
Show Author Affiliations
Meguya Ryu, Tokyo Institute of Technology (Japan)
Vygantas Mizeikis, Shizuoka Univ. (Japan)
Junko Morikawa, Tokyo Institute of Technology (Japan)
Hernando Magallanes, Univ. Bordeaux, LOMA, CNRS (France)
Etienne Brasselet, Univ. Bordeaux, LOMA, CNRS (France)
Simonas Varapnickas, Vilnius Univ. (Lithuania)
Mangirdas Malinauskas, Vilnius Univ. (Lithuania)
Saulius Juodkazis, Swinburne Univ. of Technology (Australia)
Australian National Fabrication Facility (Australia)

Published in SPIE Proceedings Vol. 10339:
Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)

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