All-optical wideband spectrum analyzer in nano-scale using metal composite nanoparticle

In this paper, we demonstrate a compact and integrated optical spectrum analyzer (OSA) based on metal composite single nanoparticle. We present and analyze an OSA at nanoscale which is able to selected different frequency contents of the incident field and illustrate with corresponding different amplitudes and wavelengths on monitor. The spectrum analyzer is composed of a single metal nanocomposite particle, forming relatively tunable narrowband filter implemented by Electromagnetically Induced Transparency (EIT) that operates at different frequencies. The composite metal nanoparticle composed of plasmonic core-shell nanoparticle is used as a building block for this idea in our study. Also, the proposed idea can easily be integrated on optical chips. The present design is simple for realization using optical integrated circuits, and has high accuracy and compact. This new OSA is suitable for spectroscopy of molecular systems in a nanoscale pattern for increasing density of integration in integrated systems.