A photonic-crystal optical antenna for extremely large local-field enhancement

Interaction of two guided-mode resonances in an all-dielectric photonic crystal for uniform SERS

For sensing and imaging applications of surface-enhanced Raman scattering (SERS), one needs a substrate with the capability of generating a consistent and uniform response and increased signal enhancement. To this goal, we propose a photonic-crystal (PC) structure capable of supporting large field enhancement due to its high quality-factor resonance. Moreover, we demonstrate that the interaction of two modes of this all-dielectric PC can provide an almost uniform field enhancement across the unit cell of the PC. This is of practical importance for SERS applications. The designed structure can support a maximum field enhancement of 70 and 97 percent of uniformity.

All-optical wireless wavelength multiplexing and demultiplexing using resonant cavity

The potential capability of wireless wavelength multiplexing and demultiplexing can enable the next development of smaller photonic counterparts for network architectures. This paper numerically represents a new design of a wireless transmission in C-band infrared wavelengths within two identical resonant cavities between photonic chips. This system consists of an H1 rod-type two-dimensional photonic crystal (PhC) microcavity, which can be operated as both a transmitter and a receiver without interfering with the signal in each PhC waveguide. By using the point-to-point oscillatory light-field exchange between resonant cavities, two independent photonic circuits are linked with each other. The obtained results show that the multi-resonance wavelengths in one chip can be transferred to another chip located far away by ten times the highest resonance wavelength. Such a device can be useful for integrated optical circuit interconnect and small-scale sensors between photonic chips.