Focusing and imaging with increased numerical apertures through multimode fibers with micro-fabricated optics

Silvio Bianchi, V. Rajamanickam, Lorenzo Ferrara, Enzo M. Di Fabrizio, Carlo Liberale, Roberto Di Leonardo

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The use of individual multimode optical fibers in endoscopy applications has the potential to provide highly miniaturized and noninvasive probes for microscopy and optical micromanipulation. A few different strategies have been proposed recently, but they all suffer from intrinsically low resolution related to the low numerical aperture of multimode fibers. Here, we show that two-photon polymerization allows for direct fabrication of micro-optics components on the fiber end, resulting in an increase of the numerical aperture to a value that is close to 1. Coupling light into the fiber through a spatial light modulator, we were able to optically scan a submicrometer spot (300 nm FWHM) over an extended region, facing the opposite fiber end. Fluorescence imaging with improved resolution is also demonstrated. © 2013 Optical Society of America.
Original languageEnglish (US)
Pages (from-to)4935
JournalOptics Letters
Volume38
Issue number23
DOIs
StatePublished - Nov 18 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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