M. Sumetsky

OFS Fitel Denmark, Glostrup, Capital Region, Denmark

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Publications (81)153.02 Total impact

  • M Sumetsky
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    ABSTRACT: A coupled resonator optical waveguide (CROW) bottle is a bottle-shaped nonuniform distribution of resonator and coupling parameters. This Letter solves the inverse problem for a CROW bottle, i.e., develops a simple analytical method that determines a CROW with the required group delay and dispersion characteristics. In particular, the parameters of CROWs exhibiting the group delay with zero dispersion (constant group delay) and constant dispersion (linear group delay) are found.
    Optics Letters 04/2014; 39(7):1913-6. · 3.39 Impact Factor
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    M Sumetsky
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    ABSTRACT: It is shown theoretically that an optical bottle resonator with a nanoscale radius variation can perform a multinanosecond long dispersionless delay of light in a nanometer-order bandwidth with minimal losses. Experimentally, a 3 mm long resonator with a 2.8 nm deep semiparabolic radius variation is fabricated from a 19 μm radius silica fiber with a subangstrom precision. In excellent agreement with theory, the resonator exhibits the impedance-matched 2.58 ns (3 bytes) delay of 100 ps pulses with 0.44 dB/ns intrinsic loss. This is a miniature slow light delay line with the record large delay time, record small transmission loss, dispersion, and effective speed of light.
    Physical Review Letters 10/2013; 111(16):163901. · 7.73 Impact Factor
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    M Sumetsky
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    ABSTRACT: A delay line fabricated of a chain of SNAP (Surface Nanoscale Axial Photonics) coupled microresonators is demonstrated. In contrast to resonant delay lines demonstrated to date, the slow light in this structure is enhanced by the 2R (Rotation + Reflection) effect realized due to the 3D propagation of light along the surface of a SNAP fiber. Here, the delay line coupled to a single input/output waveguide (i.e., operating in the reflection mode) is considered. Depending on the coupling parameters and loss, the delay time in this device is either proportional to the density of resonances averaged over the pulse spectrum or tends to zero. The delay line is fabricated of 20 coupled microresonators with the total length of 1.2 mm and footprint area of 0.05 mm<sup>2</sup>. It exhibits the record low insertion loss (< 3 dB), small speed of light (<c/250), and large (>1 ns) delay time along the 0.1 nm bandwidth achieved for the miniature microresonator delay lines. The feasibility of significant improvement of the SNAP delay line characteristics (larger delay time and bandwidth, smaller losses and dimensions, and anti-reflecting apodization) is discussed.
    Optics Express 07/2013; 21(13):15268-15279. · 3.55 Impact Factor
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    M. Sumetsky
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    ABSTRACT: A low-loss CROW delay line with a weak inter-resonator coupling determined by the Kac matrix is dispersionless and can be easily impedance-matched by adjusting the coupling to the input/output waveguide.
    05/2013;
  • M Sumetsky, Y Dulashko
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    ABSTRACT: Based on the recently-introduced Surface Nanoscale Axial Photonics (SNAP) platform, we demonstrate a chain of 30 coupled SNAP microresonators spaced by 50 micron along an optical fiber, which is fabricated with the precision of 0.7 angstrom and a standard deviation of 0.12 angstrom in effective microresonator radius. To the best of our knowledge, this result surpasses those achieved in other super-low-loss photonic technologies developed to date by two orders of magnitude. The chain exhibits bandgaps in both the discrete and continuous spectrum in excellent agreement with theory. The developed method enables robust fabrication of SNAP devices with sub-angstrom precision.
    Optics Express 12/2012; 20(25):27896-901. · 3.55 Impact Factor
  • M Sumetsky
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    ABSTRACT: A SNAP (Surface Nanoscale Axial Photonics) device consists of an optical fiber with introduced nanoscale effective radius variation, which is coupled to transverse input/output waveguides. The input waveguides excite whispering gallery modes circulating near the fiber surface and slowly propagating along the fiber axis. In this paper, the theory of SNAP devices is developed and applied to the analysis of transmission amplitudes of simplest SNAP models exhibiting a variety of asymmetric Fano resonances and also to the experimental characterization of a SNAP bottle microresonator and to a chain of 10 coupled microresonators. Excellent agreement between the theory and the experiment is demonstrated.
    Optics Express 09/2012; 20(20):22537-54. · 3.55 Impact Factor
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    ABSTRACT: We introduce multiple series of uncoupled and coupled surface nanoscale axial photonics (SNAP) microresonators along the 30 micron diameter germanium-doped photosensitive silica optical fiber and demonstrate their permanent trimming and temporary tuning with a CO2 laser and a wire heater. Hydrogen loading allows us to increase the introduced variation of the effective fiber radius by an order of magnitude compared to the unloaded case, i.e., to around 5 nm. It is demonstrated that the CO2 laser annealing of the fabricated microresonator chain can be used to modify the fiber radius variation. Depending on the CO2 laser beam power, the microresonator effective radius variation can be increased in depth up to the factor of two or completely erased. In addition, we demonstrate temporary tuning of a microresonator chain with a wire heater.
    Optics Express 05/2012; 20(10):10684-91. · 3.55 Impact Factor
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    ABSTRACT: We experimentally demonstrate series of identical two, three, and five coupled high Q-factor surface nanoscale axial photonics (SNAP) microresonators formed by periodic nanoscale variation of the optical fiber radius. These microresonators are fabricated with a 100 μm period along an 18 μm radius optical fiber. The axial FWHM of these microresonators is 80 μm and their Q-factor exceeds 10(7). In addition, we demonstrate a SNAP microresonator with the axial FWHM as small as 30 μm and the axial FWHM of the fundamental mode as small as 10 μm. These results may potentially enable the dense integration of record low loss coupled photonic microdevices on the optical fiber platform.
    Optics Letters 03/2012; 37(6):990-2. · 3.39 Impact Factor
  • M. Sumetsky
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    ABSTRACT: Surface Nanoscale Axial Photonics (SNAP) is a recently introduced platform for fabrication of complex miniature photonics circuits and devices by nanoscale variation of the optical fiber radius. It is shown that such dramatically small deformation of the optical fiber (and/or equivalent variation of refractive index) is sufficient to localize the whispering gallery modes propagating along the fiber surface normal to its axis and to create high Q-factor microresonators. Reproducible fabrication of these microresonators with angstrom accuracy supports the robustness of the SNAP platform. Series of identical high Q-factor SNAP microresonators coupled to each other are demonstrated. Due to the significantly smaller surface roughness of drawn silica compared to the roughness of surfaces fabricated lithographically, it is expected that the SNAP circuits will enable orders of magnitude smaller attenuation of light compared to the planar ring microresonator and photonic crystal microcavity circuits.
    Transparent Optical Networks (ICTON), 2012 14th International Conference on; 01/2012
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    M Sumetsky, J M Fini
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    ABSTRACT: Dense photonic integration promises to revolutionize optical computing and communications. However, efforts towards this goal face unacceptable attenuation of light caused by surface roughness in microscopic devices. Here we address this problem by introducing Surface Nanoscale Axial Photonics (SNAP). The SNAP platform is based on whispering gallery modes circulating around the optical fiber surface and undergoing slow axial propagation readily described by the one-dimensional Schrödinger equation. These modes can be steered with dramatically small nanoscale variation of the fiber radius, which is quite simple to introduce in practice. Extremely low loss of SNAP devices is achieved due to the low surface roughness inherent in a drawn fiber surface. In excellent agreement with the developed theory, we experimentally demonstrate localization of light in quantum wells, halting light by a point source, tunneling through potential barriers, dark states, etc. This demonstration has intriguing potential applications in filtering, switching, slowing light, and sensing.
    Optics Express 12/2011; 19(27):26470-85. · 3.55 Impact Factor
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    ABSTRACT: Recently introduced surface nanoscale axial photonics (SNAP) makes it possible to fabricate high-Q-factor microresonators and other photonic microdevices by dramatically small deformation of the optical fiber surface. To become a practical and robust technology, the SNAP platform requires methods enabling reproducible modification of the optical fiber radius at nanoscale. In this Letter, we demonstrate superaccurate fabrication of high-Q-factor microresonators by nanoscale modification of the optical fiber radius and refractive index using CO2 laser and UV excimer laser beam exposures. The achieved fabrication accuracy is better than 2 Å in variation of the effective fiber radius.
    Optics Letters 12/2011; 36(24):4824-6. · 3.39 Impact Factor
  • M. Sumetsky
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    ABSTRACT: This paper briefly reviews the optical fiber-based microresonators highlighting the recently demonstrated microbubble resonator, microcylinder resonator, and, also, the recently discovered microcone resonator. The theory, fabrication, and applications of these microresonators are discussed.
    Lasers and Electro-Optics Europe (CLEO EUROPE/EQEC), 2011 Conference on and 12th European Quantum Electronics Conference; 06/2011
  • M. Sumetsky
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    ABSTRACT: Resonant light launched by a transversely oriented microfiber along the surface of an optical fiber with nanoscale radius variation features turning points, quantum wells, dark states, etc., described theoretically and demonstrated experimentally.
    05/2011;
  • M. Sumetsky
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    ABSTRACT: The transmission spectrum of the recently discovered localized conical modes in an optical fiber exhibits a cut-off effect at the wavelength independent of the local fiber radius. This effect is observed experimentally and explained theoretically.
    04/2011;
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    M. Sumetsky
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    ABSTRACT: High Q-factor localized conical modes are discovered theoretically and demonstrated experimentally in an optical fiber. The theory of these modes provides a means for exceptionally accurate local characterization of the optical fiber nonuniformity.
    Optical Fiber Communication Conference and Exposition (OFC/NFOEC), 2011 and the National Fiber Optic Engineers Conference; 04/2011
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    M Sumetsky
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    ABSTRACT: The classical rays propagating along a conical surface are bounded on the narrower side of the cone and unbounded on its wider side. In contrast, it is shown here that a dielectric cone with a small half-angle γ can perform as a high Q-factor optical microresonator which completely confines light. The theory of the discovered localized conical states is confirmed by the experimental demonstration, providing a unique approach for accurate local characterization of optical fibers (which usually have γ ~ 10(-5) or less) and a new paradigm in the field of high Q-factor resonators.
    Optics Letters 01/2011; 36(2):145-7. · 3.39 Impact Factor
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    ABSTRACT: We demonstrate super-accurate fabrication of high Q-factor microresonators by nanoscale modification of the optical fiber radius and refractive index. The achieved fabrication accuracy is better than 2 angstroms in variation of the effective fiber radius.
    01/2011;
  • M. Sumetsky
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    ABSTRACT: A slightly nonuniform and even an ideally uniform optical fiber can perform as a high Q-factor optical microresonator which hosts different types of strongly localized states localized near the fiber surface. These states are usually excited by a transverse microfiber waveguide and can be classified into whispering gallery bottle, cylinder, and conical states. The whispering gallery bottle states can be excited in a fiber segment with tapered ends. The cylinder and conical states can be excited by a transverse microfiber in a uniform optical fiber and in a fiber having the shape of a cone with a small half-angle, respectively. In this paper, the theory and application of the whispering gallery bottle, cylindrical, and conical microresonators is reviewed.
    01/2011;
  • M Sumetsky, Y Dulashko
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    ABSTRACT: We have developed a robust method for the unprecedentedly accurate angstrom-scale detection of local variations of the fiber radius based on the idea suggested by Birks et al. [IEEE Photon. Technol. Lett. 12, 182 (2000)]. The method uses an optical microfiber (MF) translated at a small distance along the tested fiber and periodically touching it at measurement points. At these points, the MF transmission spectrum exhibits whispering-gallery-mode (WGM) resonances shifting with the tested fiber radius. A simple and comprehensive optimization scheme, which determines the radius variation without visual recognition of resonances and treats their shifts simultaneously, is developed. The optics of WGM propagation is discussed, and the condition for the validity of the developed method is established.
    Optics Letters 12/2010; 35(23):4006-8. · 3.39 Impact Factor
  • M Sumetsky
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    ABSTRACT: As opposed to the modes in an optical spherical/spheroidal microresonator, the whispering gallery modes in a long cylindrical microresonator are delocalized. Consequently, a circulating light beam that is evanescently coupled into the cylinder and experiences total internal reflection eventually radiates out along the cylinder axis. However, the self-interference of such a beam can produce a resonant mode that is strongly localized along the axial direction. Specifically, the mode characteristic width is (alphabeta)(-1/2), where alpha and beta are the attenuation and propagation constants of the cylinder material. The Q-factor of this mode can be almost as large as the Q-factor of modes in a spheroidal microresonator with the same alpha divided by 2.542.
    Optics Letters 07/2010; 35(14):2385-7. · 3.39 Impact Factor