Indeed, this is what M. Panmai and coworkers succeeded to demonstrate. They designed an all-silicon-based nano-antenna that can work as a wavelength and polarization demultiplexer. The key of their achievement is in the asymmetric structure of the nano-antenna, which induces electric and magnetic dipole and quadrupole modes. The interference among these modes is utilized to shape the field radiated by the nano-antenna. As the interference is strongly dependent on the wavelength and polarization of the incident light, the proposed structure can be efficiently used to realize wavelength and polarization demultiplexing. Noteworthily, the fabrication of this device is fully compatible with standard fabrication technology of silicon chips.
We can expect that these new multiplexing functionalities can boost the exploitation of nano-antennas in all the areas where they are commonly employed, such as high-efficiency light detectors, imaging, sensors, solar cells, and optical processing.
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