NDLI: Radiation-harvesting resonant superconducting sub-THz metamaterial bolometer

Content Provider	IEEE Xplore Digital Library
Author	Savinov, V. Fedotov, V.A. de Groot, P.A.J. Zheludev, N.I.
Copyright Year	2013
Description	Author affiliation: Optoelectron. Res. Centre, Univ. of Southampton, Southampton, UK (Savinov, V.; Fedotov, V.A.; Zheludev, N.I.) \|\| Centre for Photonic Metamaterials, Univ. of Southampton, Southampton, UK (de Groot, P.A.J.)
Abstract	Summary form only given. The ability of metamaterials to concentrate energy of the incident radiation on the sub-wavelength scale has long been predicted to lead to new device applications with a significantly improved and even superior functionality; the concrete implementations are, however, only beginning to emerge. Here we show how combining the concept of a superconducting bolometer with the coherent metamaterial paradigm allows to create a very sensitive sub-THz radiation detector with high spectral selectivity of $ν_{0}/Δν$ ~ 90.Figure 1a illustrates the solution. Our bolometer is based on asymmetrically-split-ring (ASR) metamaterial with a characteristic narrow BIT-like resonance which is extremely sensitive to Joule losses. It also belongs to a novel, special class of coherent metamaterials, where the resonant response results from the collective excitation of the entire metamaterial array underpinned by strong interactions between its metamolecules. The metamaterial design features an additional `signal line' that electrically connects all metamolecules into a single network. We manufacture the metamaterial by patterning the thin niobium film on the sapphire substrate with standard UVphotolithography. The measurements are conducted by placing the metamaterial into the optical cryostat and cooling it down to temperature 5K. At such temperatures the niobium becomes superconducting which results in a sharp, low-loss metamaterial response in the sub-THz range (see Fig. 1b). We apply the bias of Vb = 4V (see Fig. 1a) to create a small hotspot within the metamaterial array (- 5% of the total area) where niobium is just below the superconducting transition point and is therefore very sensitive to Joule heating caused by the incident radiation. Strong interactions between the metamolecules that are typical to ASR metamaterial at its coherent resonance lead to channelling of radiation energy from the outer regions of the metamaterial into the hotspot, thus allowing to combine the narrow spectral response with the extreme sensitivity, resulting in the overall very efficient radiation-detecting device.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	297314
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6800790
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage measurement Bolometers Educational institutions Metamaterials Arrays Niobium Photonics
Content Type	Text
Resource Type	Article

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