M. Sumetsky

Aston University, Wheaton Aston, England, United Kingdom

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Publications (94)154.06 Total impact

  • L. A. Kochkurov, M. Sumetsky
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    ABSTRACT: We introduce a whispering gallery-mode (WGM) nanobump microresonator (NBMR) and develop its theory. This microresonator is formed by an asymmetric nanoscale-high deformation of the translationally symmetric optical fiber surface, which is employed in fabrication of surface nanoscale axial photonics (SNAP) structures. It is shown that an NBMR causes strong localization of WGMs near a closed ray (geodesic) at the fiber surface, provided that this ray is stable. Our theory explains and describes the experimentally observed localization of WGMs by NBMRs and is useful for the design and fabrication of SNAP devices.
    Optics Letters 04/2015; 40(7). DOI:10.1364/OL.40.001430 · 3.18 Impact Factor
  • L A Kochkurov, M Sumetsky
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    ABSTRACT: We introduce a whispering gallery-mode (WGM) nanobump microresonator (NBMR) and develop its theory. This microresonator is formed by an asymmetric nanoscale-high deformation of the translationally symmetric optical fiber surface, which is employed in fabrication of surface nanoscale axial photonics (SNAP) structures. It is shown that an NBMR causes strong localization of WGMs near a closed ray (geodesic) at the fiber surface, provided that this ray is stable. Our theory explains and describes the experimentally observed localization of WGMs by NBMRs and is useful for the design and fabrication of SNAP devices.
    Optics Letters 04/2015; 40(7):1430-3. · 3.18 Impact Factor
  • M. Sumetsky
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    ABSTRACT: The resonant slow light structures created along a thin-walled optical capillary by nanoscale deformation of its surface can perform comprehensive simultaneous detection and manipulation of microfluidic components. This concept is illustrated with a model of a 0.5 mm long, 5 nm high, triangular bottle resonator created at a 50 μm radius silica capillary containing floating microparticles. The developed theory shows that the microparticle positions can be determined from the bottle resonator spectrum. In addition, the microparticles can be driven and simultaneously positioned at predetermined locations by the localized electromagnetic field created by the optimized superposition of eigenstates of this resonator, thus exhibiting a multicomponent, near-field optical tweezer.
    Optics Letters 10/2014; 39(19). DOI:10.1364/OL.39.005578 · 3.18 Impact Factor
  • M. Sumetsky
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    ABSTRACT: Miniature slow light Surface Nanoscale Axial Photonics (SNAP) devices are reviewed. The fabrication precision of these devices is two orders of magnitude higher and the transmission losses are two orders of magnitude smaller than for any of the previously reported technologies for fabrication of miniature photonic circuits. In the first part of the report, a SNAP bottle resonator with a few nm high radius variation is demonstrated as the record small, slow light, and low loss 2.6 ns dispersionless delay line of 100 ps pulses. Next, a record small SNAP bottle resonator exhibiting the 20 ns/nm dispersion compensation of 100 ps pulses is demonstrated. In the second part of the report, the prospects of the SNAP technology in applications to telecommunications, optical signal processing, quantum computing, and microfluidics are discussed.
    2014 16th International Conference on Transparent Optical Networks (ICTON); 07/2014
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    M. Sumetsky
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    ABSTRACT: The resonant slow light structures created along a thin-walled optical capillary by nanoscale deformation of its surface can perform comprehensive simultaneous detection and manipulation of microfluidic components. This concept is illustrated with a model of a 0.5 millimeter long 5 nm high triangular bottle resonator created at a 50 micron radius silica capillary containing floating microparticles. The developed theory shows that the microparticle positions can be determined from the bottle resonator spectrum. In addition, the microparticles can be driven and simultaneously positioned at predetermined locations by the localized electromagnetic field created by the optimized superposition of eigenstates of this resonator, thus, exhibiting a multicomponent near field optical tweezers.
  • 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. (C) 2014 Optical Society of America
    Optics Letters 04/2014; 39(7):1913-6. DOI:10.1364/OL.39.001913 · 3.18 Impact Factor
  • M. Sumetsky
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    ABSTRACT: This review is concerned with nanoscale effects in highly transparent dielectric photonic structures fabricated from optical fibers. In contrast to those in plasmonics, these structures do not contain metal particles, wires, or films with nanoscale dimensions. Nevertheless, a nanoscale perturbation of the fiber radius can significantly alter their performance. This paper consists of three parts. The first part considers propagation of light in thin optical fibers (microfibers) having the radius of the order of 100 nanometers to 1 micron. The fundamental mode propagating along a microfiber has an evanescent field which may be strongly expanded into the external area. Then, the cross-sectional dimensions of the mode and transmission losses are very sensitive to small variations of the microfiber radius. Under certain conditions, a change of just a few nanometers in the microfiber radius can significantly affect its transmission characteristics and, in particular, lead to the transition from the waveguiding to non-waveguiding regime. The second part of the review considers slow propagation of whispering gallery modes in fibers having the radius of the order of 10-100 microns. The propagation of these modes along the fiber axis is so slow that they can be governed by extremely small nanoscale changes of the optical fiber radius. This phenomenon is exploited in SNAP (surface nanoscale axial photonics), a new platform for fabrication of miniature super-low-loss photonic integrated circuits with unprecedented sub-angstrom precision. The SNAP theory and applications are overviewed. The third part of this review describes methods of characterization of the radius variation of microfibers and regular optical fibers with sub-nanometer precision.
    11/2013; 2(5-6). DOI:10.1515/nanoph-2013-0041
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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. DOI:10.1103/PhysRevLett.111.163901 · 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. DOI:10.1364/OE.21.015268 · 3.53 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.
  • M. Sumetsky
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    ABSTRACT: A slow light miniature delay line with a breakthrough performance is proposed and demonstrated. This delay line has a shape of a strongly elongated bottle resonator with a nanoscale radius variation. It is shown that this resonator can perform a multi-nanosecond long dispersionless delay of light in a nanometer-order bandwidth with minimal losses. In excellent agreement with the developed theory, a 3 mm long 0.12 mm2 footprint bottle resonator, which exhibits dispersionless 2.58 ns (3 bytes) delay of 100 ps pulses with 0.44 dB/ns intrinsic loss and 1.2 dB/ns full loss, is demonstrated experimentally.
    Transparent Optical Networks (ICTON), 2013 15th International Conference on; 01/2013
  • 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. DOI:10.1364/OE.20.027896 · 3.53 Impact Factor
  • Optics and Photonics News 12/2012; 23(12):37-. DOI:10.1364/OPN.23.12.000037
  • 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. DOI:10.1364/OE.20.022537 · 3.53 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. DOI:10.1364/OE.20.010684 · 3.53 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. DOI:10.1364/OL.37.000990 · 3.18 Impact Factor
  • M. Sumetsky
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    ABSTRACT: The transmission amplitudes of SNAP (Surface Nanoscale Axial Photonics) devices are determined and applied to investigation of basic SNAP structures.
    Photonics Conference (IPC), 2012 IEEE; 01/2012
  • 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. DOI:10.1364/OE.19.026470 · 3.53 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. DOI:10.1364/OL.36.004824 · 3.18 Impact Factor