Arnab Dewanjee | Searcharxiv

arXiv2017

Broadside High Index Dielectric Beam Routing

We propose a technique to control the beam direction of a dielectric optical micro-prism structure by properly designing its geometry. We show that by selectively choosing the slope of a high index micro prism, the direction of the radiated beam from the tip can be controlled in the broadside direction of the prism structure. We propose an easy fabrication method to integrate such broadside beam routers on a Si platform. We also propose a demonstrate a technique to build the beam router on an elastic PDMS platform which demonstrates stress induced beam scanning in the broadside This specific feature of beam direction control can find application in free space optical interconnects, plasmonics, solar cells, detectors, optical sensing etc.

physics.optics↗

arXiv2016

An Efficient and Compact Excitation of Surface Plasmons Using a Si Gable Tip

We propose a novel technique to efficiently excite a surface plasmon polariton (SPP) mode at a gold-glass interface by exploiting the near field excitation of an engineered high index (silicon) gabled tip at the telecom wavelengths. The proposed structure can theoretically convert 49% of the input optical power to a SPP mode. The device is compact, it will facilitate the on-chip excitation of the SPP, its fabrication is compatible with the standard Si fabrication processes, and as such, it is expected to be useful in the design of future integrated sensors.

physics.optics↗