Optical metamaterials for decontamination of translucent liquids and gases
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ENAKI, N.; PROFIR, Aurelia; CIOBANU, Nellu; BAZGAN, Sergiu; NISTREANU, Andrei; ŢURCAN, Marina; STARODUB, Elena; PASLARI, Tatiana R.; RISTOSCU, Carmen; BADICEANU, Maria; MIHĂILESCU, Ion. Optical metamaterials for decontamination of translucent liquids and gases. In: Journal of Physics D: Applied Physics. 2018, nr. 38(51), p. 0. ISSN 0022-3727.
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Journal of Physics D: Applied Physics
Numărul 38(51) / 2018 / ISSN 0022-3727 /ISSNe 1361-6463

Optical metamaterials for decontamination of translucent liquids and gases

DOI: 10.1088/1361-6463/aad705
Pag. 0-0

Enaki N.1, Profir Aurelia12, Ciobanu Nellu34, Bazgan Sergiu3, Nistreanu Andrei3, Ţurcan Marina3, Starodub Elena3, Paslari Tatiana R.3, Ristoscu Carmen5, Badiceanu Maria56, Mihăilescu Ion5
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 State University of Moldova,
3 Institute of Applied Physics,
4 ”Nicolae Testemițanu” State University of Medicine and Pharmacy,
5 National Institute for Laser, Plasma and Radiation Physics (INFLPR),
6 University of Bucharest
Disponibil în IBN: 7 decembrie 2018


Metamaterials with periodical structures like quartz or glass small granules irradiated by UV-C to act against microbial contamination of translucent liquids and gases are studied. Investigations of the modifications of individual metamaterial elements when UV evanescent waves are dispersed in the optical contact zone, as a function of granule geometry, were performed. Different situations were investigated, when quartz (SiO2), glass, or black (plastic) materials with dimensions of about 0.5-3 mm are separately placed into a quartz tube of about 2.7 cm diameter and 90 cm length, named 'core tube'. Quartz granules transmit within the 240-400 nm region of the Hg lamp and ensure an effective decontamination of translucent liquids and gases. Our approach is based upon the increased transfer of UV radiation via evanescent waves in case of unordered metamaterials present in contaminated fluids. We made a series of estimations of the decontamination rate of this type of metamaterials versus ordered metamaterials consisting of spherical elements. Experiments have convincingly demonstrated that both quartz and glass metamaterials can effectively annihilate Coliform (including Escherichia coli) or Enterococcus bacteria, as well as yeast and Kombucha cultures. The decontamination efficiency was assessed both in dynamic and static treatment regimes. Control experiments were performed in the absence of metamaterials and/or UV-C irradiation.

biomedical applications, Metamaterials, optically active materials, Photonic Crystals