Anomalous retroreflection from strongly absorbing nanoporous semiconductors
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PRISLOPSKI, Sergey, NAUMENKO, Elena, TIGINYANU, Ion, GHIMPU, Lidia, MONAICO, Eduard, SIRBU, Lilian, GAPONENCO, Sergey. Anomalous retroreflection from strongly absorbing nanoporous semiconductors. In: Optics Letters, 2011, vol. 36, pp. 3227-3229. ISSN 0146-9592. DOI: https://doi.org/10.1364/OL.36.003227
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Optics Letters
Volumul 36 / 2011 / ISSN 0146-9592 /ISSNe 1539-4794

Anomalous retroreflection from strongly absorbing nanoporous semiconductors

DOI:https://doi.org/10.1364/OL.36.003227

Pag. 3227-3229

Prislopski Sergey1, Naumenko Elena1, Tiginyanu Ion23, Ghimpu Lidia2, Monaico Eduard3, Sirbu Lilian2, Gaponenco Sergey1
 
1 Stepanov Institute of Physics, National Academy of Sciences of Belarus,
2 Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu" of the Academy of Sciences of Moldova,
3 Technical University of Moldova
 
Teze de doctorat:
 
Disponibil în IBN: 28 martie 2018


Rezumat

Pronounced retroreflection behavior is reported for a fishnet nanoporous strongly absorbing semiconductor material. Retroreflection features a half-cone about 0:35 rad along with diffusive specular reflection for all angles of incidence. Retroreflection is apparent by the naked eye with daylight illumination and exhibits no selectivity with respect to wavelength and polarization of incident light featuring minor depolarization of retroreflected light. The reflectance in the backward direction measures 12% with respect to a white scattering etalon. The phenomenon can be classified neither as coherent backscattering nor as Anderson localization of light. The primary model includes light scattering from strongly absorptive and refractive superwavelength clusters existing within the porous fishnet structure. A reasonable qualitative explanation is based on the fact that strict retroreflection obeys shorter paths inside absorbing medium, whereas all alternative paths will lead to stronger absorption of light.

Cuvinte-cheie
Absorbing medium, Alternative path, Anderson localization, Angles of incidence, Coherent backscattering, Fishnet structureIncident light, Naked-eyeNano-porous, Retro reflection, Specular reflections