Abstract
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.
Highlights
We synthesized by colloidal chemistry way the quantum confined CdSe nanocrystals of different dimensionality: OD, 1D, 2D
The room temperature electrooptical effects were studied in form of differential absorption spectra of nanocrystals versus the applied electric field
We observed an order of magnitude larger electrooptical response from CdSe platelets, as compared to quantum dots, while, CdSe nanorods show a little effect
Summary
Anomalous retroreflection from strongly absorbing nanoporous semiconductors I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Belarus; 2Institute of Electronic Engineering and Nanotechnologies “D. Ghitu”, Academy of Sciences of Moldova, Moldova; 3National Centre for Materials Study and Testing, Technical University of Moldova, Moldova Pronounced retroreflection behavior is reported for a fishnet nanoporous strongly absorbing semiconductor material.
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