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Magyar, Andrew

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Magyar

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Andrew

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Magyar, Andrew
Author's Publications: search.filters.isAuthorOfPublication.23a8f20f-f576-4759-bd9b-b08caa6f4fc8

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Now showing 1 - 4 of 4
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    The structure-function relationships of a natural nanoscale photonic device in cuttlefish chromatophores
    (The Royal Society, 2014) Deravi, L. F.; Magyar, Andrew; Sheehy, Sean Paul; Bell, G. R. R.; Mathger, L. M.; Senft, S. L.; Wardill, T. J.; Lane, W. S.; Kuzirian, A. M.; Hanlon, R. T.; Hu, Evelyn; Parker, K. K.
    Cuttlefish, Sepia officinalis, possess neurally controlled, pigmented chromatophore organs that allow rapid changes in skin patterning and coloration in response to visual cues. This process of adaptive coloration is enabled by the 500% change in chromatophore surface area during actuation. We report two adaptations that help to explain how colour intensity is maintained in a fully expanded chromatophore when the pigment granules are distributed maximally: (i) pigment layers as thin as three granules that maintain optical effectiveness and (ii) the presence of high-refractive-index proteins—reflectin and crystallin—in granules. The latter discovery, combined with our finding that isolated chromatophore pigment granules fluoresce between 650 and 720 nm, refutes the prevailing hypothesis that cephalopod chromatophores are exclusively pigmentary organs composed solely of ommochromes. Perturbations to granular architecture alter optical properties, illustrating a role for nanostructure in the agile, optical responses of chromatophores. Our results suggest that cephalopod chromatophore pigment granules are more complex than homogeneous clusters of chromogenic pigments. They are luminescent protein nanostructures that facilitate the rapid and sophisticated changes exhibited in dermal pigmentation.
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    Silicon-Vacancy Color Centers in Nanodiamonds: Cathodoluminescence Imaging Markers in the Near Infrared
    (Wiley-Blackwell, 2014) Zhang, Huiliang; Aharonovich, Igor; Glenn, David R.; Schalek, Richard; Magyar, Andrew; Lichtman, Jeff; Hu, Evelyn; Walsworth, Ronald
    Nanodiamonds doped with silicon-vacancy (Si-V) color centers are shown to be a promising candidate for cathodoluminescence (CL) imaging at the nanoscale, providing bright, non-bleaching, narrow-linewidth emission at wavelengths within the near-IR window of biological tissue. CL emission intensity from negative charge-state Si-V centers is greatly enhanced by increasing the nitrogen concentration during nanodiamond growth.
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    Coupling of Silicon-Vacancy Centers to a Single Crystal Diamond Cavity
    (Optical Society of America, 2012) Lee, Jonathan C.; Aharonovich, Igor; Magyar, Andrew; Rol, Fabian; Hu, Evelyn
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    Homoepitaxial Growth of Single Crystal Diamond Membranes for Quantum Information Processing
    (Wiley Blackwell, 2012) Aharonovich, Igor; Lee, Jonathan C.; Magyar, Andrew; Buckley, Bob B.; Yale, Christopher G.; Awschalom, David D.; Hu, Evelyn
    Fabrication of devices designed to fully harness the unique properties of quantum mechanics through their coupling to quantum bits (qubits) is a prominent goal in the field of quantum information processing (QIP). Among various qubit candidates, nitrogen vacancy (NV) centers in diamond have recently emerged as an outstanding platform for room temperature QIP. However, formidable challenges still remain in processing diamond and in the fabrication of thin diamond membranes, which are necessary for planar photonic device engineering. Here we demonstrate epitaxial growth of single crystal diamond membranes using a conventional microwave chemical vapor deposition (CVD) technique. The grown membranes, only a few hundred nanometers thick, show bright luminescence, excellent Raman signature and good NV center electronic spin coherence times. Microdisk cavities fabricated from these membranes exhibit quality factors of up to 3000, overlapping with NV center emission. Our methodology offers a scalable approach for diamond device fabrication for photonics, spintronics, optomechanics and sensing applications.