Calculation and experimental verification of two-dimensional focusing grating couplers

Heitmann, D.; Ortiz, Carlos

doi:10.1109/jqe.1981.1071260

Cited by 50 publications

(12 citation statements)

References 15 publications

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“…The designs presented here can be generated with simple numerical calculations and two-dimensional electromagnetic simulations of uniform periodic structures; hence designs can be drawn relatively rapidly, and this approach may serve as an efficient starting point for further numerical optimization. In contrast to previous work on similar waveguide devices generating focused beams [11][12][13][14][15][16] , these devices demonstrate precise tailoring of the transverse field profile and as a result, control over both lowintensity sidelobes and polarization purity of the beams generated. a) Electronic mail: karanm@mit.edu…”

Section: Introductionmentioning

confidence: 84%

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

Mehta

Ram

2017

Sci Rep

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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 integrated optics.

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Section: Introductionmentioning

confidence: 84%

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

Mehta

Ram

2017

Sci Rep

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“…where n* is the effective refraction index of surface wave, k is the order of spectrum (k<O), -is the free space wavelength, m(p) is the number of grooves on the surface of grating between its top and of arbitrary point P. It is undifficult to receive expression for period of grating in its centre from last relationship (2) JO=/fl* (3) Using the relationship, relating number m with period change on surface of the grating m(P)f) (4) we obtain from (2) with account of(3)…”

Section: Theorymentioning

confidence: 99%

New laser-disk pickup device based on a waveguide with circular grating pair

Bazhanov¹,

Shaposhnikov²,

Andrianov³

1998

SPIE Proceedings

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“…A focusing grating coupler platform must be utilized for this application. Phase engineered gratings have been shown to focus the bea demonstration this techniqu [15]. Electron platforms we spectrum ana centimeters a reported on S visible range applications.…”

Section: Introductionmentioning

confidence: 99%

On-chip fluorescence excitation and collection by focusing grating couplers

et al. 2016

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Fluorescence detection is a commonly used technique to detect particles. Microscopes are used for the fluorescence detection of the micro-particles. However, the conventional microscopes are bulky. It is cumbersome to integrate all the equipment used for detection in one setup. They can be replaced by photonic chips for the detection of microparticles such as cells. Most of the biological detection techniques require the utilization of the visible range of the spectrum. SiN as a waveguide material stands out for biological applications due to its transparency in the visible spectrum. Specifically designed grating couplers can be exploited to focus from inside SiN waveguides at a designated location above the chip. Those SiN focusing grating couplers can mimic microscope objectives for on-chip biological detection applications such as fluorescence and Raman spectroscopy. In this report, we present a 2D SiN focusing grating coupler. We study the effect of the grating design on the focus properties of visible light using finite-difference time-domain simulations.

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Calculation and experimental verification of two-dimensional focusing grating couplers

Cited by 50 publications

References 15 publications

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

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

New laser-disk pickup device based on a waveguide with circular grating pair

On-chip fluorescence excitation and collection by focusing grating couplers

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