A Russian-Chinese team of scientists has developed a new material at the nanoscale. This material possesses a unique property: it transmits light only within a specific, very narrow part of the spectrum, regardless of the light's orientation (its polarization). This innovation promises to significantly improve the performance of optical chips used in devices for the rapid detection of various substances, such as allergens or glucose.
We are the first to create a metasurface that supports the effect of electromagnetically induced transparency and is independent of light polarization. We conducted experimental tests of the proposed structure and confirmed the operability of our approach.
Metasurfaces are artificial structures made of nanoparticles that interact unusually with light. In this case, the metasurface becomes transparent to electromagnetic waves in a narrow frequency range due to the effect of electromagnetically induced transparency. It arises from quantum interactions between the material and two sets of waves, causing atoms to transition between three states. Specific resonances created at certain combinations of wavelengths ensure this transparency.
Subsequent versions of this material, capable of working with circular polarization, could be used to detect organic molecules "twisted" to the left or right, which is important for drug development and biological experiments, the scientists concluded.
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