High refractive index Fresnel lens on a fiber fabricated by nanoimprint lithography for immersion applications.

In this Letter, we present a Fresnel lens fabricated on the end of an optical fiber. The lens is fabricated using nanoimprint lithography of a functional high refractive index material, which is suitable for mass production. The main advantage of the presented Fresnel lens compared to a conventional fiber lens is its high refractive index (n=1.68), which enables efficient light focusing even inside other media, such as water or an adhesive. Measurement of the lens performance in an immersion liquid (n=1.51) shows a near diffraction limited focal spot of 810 nm in diameter at the 1/e2 intensity level for a wavelength of 660 nm. Applications of such fiber lenses include integrated optics, optical trapping, and fiber probes.

[1]  G. Calafiore,et al.  Nanoimprint of a 3D structure on an optical fiber for light wavefront manipulation , 2016, Nanotechnology.

[2]  Joachim P Spatz,et al.  Direct patterning of vortex generators on a fiber tip using a focused ion beam. , 2016, Optics letters.

[3]  Harald Giessen,et al.  Spatial beam intensity shaping using phase masks on single-mode optical fibers fabricated by femtosecond direct laser writing , 2016 .

[4]  G. Calafiore,et al.  Printable photonic crystals with high refractive index for applications in visible light , 2016, Nanotechnology.

[5]  Ik-Bu Sohn,et al.  CO 2 Laser Assisted Fabrication of Micro-lensed Single-mode Optical Fiber , 2015 .

[6]  Hongbao Xin,et al.  Non-contact fiber-optical trapping of motile bacteria: dynamics observation and energy estimation , 2014, Scientific Reports.

[7]  Michal Lipson,et al.  High Coupling Efficiency Etched Facet Tapers in Silicon Waveguides , 2014, IEEE Photonics Technology Letters.

[8]  G. Calafiore,et al.  Printable planar lightwave circuits with a high refractive index , 2014, Nanotechnology.

[9]  Martina Gerken,et al.  Tailoring the refractive index of nanoimprint resist by blending with TiO_2 nanoparticles , 2014 .

[10]  Byeong Ha Lee,et al.  Fiber-based optical coherence tomography for biomedical imaging, sensing, and precision measurements , 2013 .

[11]  A. A. Jasim,et al.  Micro-Ball Lensed Fiber-Based Glucose Sensor , 2013, IEEE Sensors Journal.

[12]  K. Hane,et al.  Fabrication of antireflection subwavelength gratings at the tips of optical fibers using UV nanoimprint lithography. , 2013, Optics express.

[13]  Wei Bao,et al.  Mapping Local Charge Recombination Heterogeneity by Multidimensional Nanospectroscopic Imaging , 2012, Science.

[14]  Watt W. Webb,et al.  Use of a lensed fiber for a large-field-of-view, high-resolution, fiber-scanning microendoscope. , 2012, Optics letters.

[15]  S. Cabrini,et al.  Single digit nanofabrication by step-and-repeat nanoimprint lithography , 2012, Nanotechnology.

[16]  Arnan Mitchell,et al.  Nanoimprinting on optical fiber end faces for chemical sensing , 2008, International Conference on Optical Fibre Sensors.

[17]  Patrick Sandoz,et al.  Fiber microaxicons fabricated by a polishing technique for the generation of Bessel-like beams. , 2007, Applied optics.

[18]  Dan Cojoc,et al.  Axicon lens on optical fiber forming optical tweezers, made by focused ion beam milling , 2006 .

[19]  Watt W. Webb,et al.  Measurement of small forces using an optical trap , 1994 .

[20]  J. Rogers,et al.  Optical performance of holographic kinoforms. , 1989, Applied optics.