Precise and diffraction-limited waveguide-to-free-space focusing gratings

Scientific Reports
Karan K Mehta, Rajeev J Ram

Abstract

We present the design and characterization of waveguide grating devices that couple visible-wavelength light at λ = 674 nm from single-mode, high index-contrast dielectric waveguides to free-space beams forming micron-scale diffraction-limited spots a designed distance and angle from the grating. With a view to application in spatially-selective optical addressing, and in contrast to previous work on similar devices, deviations from the main Gaussian lobe up to 25 microns from the focus and down to the 5 × 10(-6) level in relative intensity are characterized as well; we show that along one dimension the intensity of these weak sidelobes approaches the limit imposed by diffraction from the finite field extent in the grating region. Additionally, we characterize the polarization purity in the focal region, observing at the center of the focus a low impurity <3 × 10(-4) in relative intensity. Our approach allows quick, intuitive design of devices with such performance, which may be applied in trapped-ion quantum information processing and generally in any systems requiring optical routing to or from objects 10 s-100 s of microns from a chip surface, but benefitting from the parallelism and density of planar-fabricated dielectric i...Continue Reading

References

Dec 21, 2004·Optics Letters·Dirk TaillaertRoel Baets
Dec 15, 2007·Optics Letters·S M SchultzT K Gaylord
Jul 1, 1997·Applied Optics·S SheardJ Zhu
Feb 12, 2008·Applied Optics·R WaldhäuslW Karthe
Jul 3, 2010·Optics Letters·Jigang WuChanghuei Yang
Jun 21, 2012·Optics Express·Jason S OrcuttVladimir Stojanović
Apr 16, 2013·Physical Review Letters·J D ThompsonM D Lukin
Jun 27, 2013·Nature Neuroscience·Adam M PackerMichael Häusser
Feb 13, 2014·Scientific Reports·Karan K MehtaRajeev J Ram
Jul 15, 2016·Optics Express·Philip ZupancicMarkus Greiner
Aug 9, 2016·Journal of Modern Optics·Mark KeilRon Folman
Nov 1, 2016·Nature Nanotechnology·Karan K MehtaJohn Chiaverini

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Citations

Nov 1, 2016·Nature Nanotechnology·Karan K MehtaJohn Chiaverini
Dec 4, 2019·Journal of Enzyme Inhibition and Medicinal Chemistry·Mariantonia LogozziStefano Fais
Oct 17, 2018·Light, Science & Applications·Sangsik KimVladimir A Aksyuk
Oct 23, 2020·Nature·R J NiffeneggerJ Chiaverini

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Methods Mentioned

BETA
chip
chips
polarization microscopy

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