Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-20-9-9545
Timestamp: 2019-04-19 10:52:19+00:00

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We demonstrate high-finesse plasmonic metamaterial with strong resonant response in the near-IR spectral range fabricated using a thin low-loss film of gold monocrystal. The monocrystal was grown using specially formulated simplified crystal growth procedure based on epitaxial deposition, which makes it readily accessible to both plasmonics and metamaterials communities.
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Fig. 1 Gold film epitaxially grown on LiF. (a) Scanning electron microscope image of the film. Inset shows the signs of crystalline structure observed in the film at an early stage of deposition: the film is seen to grow from cubic islands with some gaps and stitches appearing along <100> directions. (b) Surface roughness of the film imaged with an atomic force microscope. Colours show amplitude of the height fluctuations. (c) 1D x-ray diffraction pattern of gold film/LiF with (200) peaks. A small peak at 38° is associated with (111) reflection of gold film, and is due is to imperfect condensation on the facet. (d) Imaginary part of the dielectric constant of gold as a function of wavelength. Green circles show values retrieved for the epitaxially grown film using spectroscopic ellipsometry (large point spread above 1300 nm is due to reduced sensitivity of our spectrometer in the near-IR). The reference data are represented by red squares (bulk single crystal ), black circles (thin film with large monocrystal domains ) and black open squares (polycrystalline thin film ). Inset shows the measured and reference data for the real part of the dielectric constant.
Fig. 2 High-finesse infrared plasmonic metamaterial. (a) Scanning electron microscope image of complex asymmetrically-split ring pattern milled in epitaxial gold film. Yellow dashed box indicates elementary unit cell of the periodic pattern (size/wavelength ratio is less than 1/4). Inset shows 3D view of the milled structure. (b) Reflection spectra of the plasmonic metamaterial. Green circles show experimentally measured values, while black curve represents the result of simulation. Inset shows orientation of incident polarization with respect to the metamaterial pattern. (c) Transmission spectra of the plasmonic metamaterial. Green circles show experimentally measured values, black curve - result of simulation. Inset shows the model of the structure’s unit cell used in simulations.

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