Strong light enhancement by combining the photonic nanojet and plasmons from the nano-engineered microsphere

TL;DR

This paper introduces a nano-engineered microsphere device that combines plasmons and photonic nanojets to significantly enhance optical spectroscopy signals with low cost and high stability.

Contribution

It presents a novel design that integrates plasmons and nanojets, optimized through simulations, offering a promising, affordable enhancement method for Raman and infrared spectroscopy.

Findings

Optimized device parameters yield maximum enhancement.

Nanoelement tip radius critically influences enhancement.

Simulations indicate low-cost, high-performance potential.

Abstract

Today's cutting-edge optical spectroscopic exploratory tools, such as Raman or infrared spectroscopy, rely on methods of signal enhancement as a route for their development. These methods are indispensable for substance identification and characterization in almost any scientific, regulatory, or industrial laboratory, therefore new and better methods of enhancement are always sought after. In this paper, the design of a new optical device for enhancement is presented, called nano-engineered microsphere (NMS). This device innovatively combines plasmons, a present flagship enhancement method, with a photonic nanojet, a new and emerging enhancement tool, to provide unprecedented properties in terms of affordability, stability, and performance. By using numerical simulations, a detailed design of the device is presented, and the optimization of device parameters for the strongest enhancement is investigated. The simulations show different influences of the parameters on the enhancement, from low to critical. The most influential parameter was found to be the radius of the nanoelement tip, which, at low values, showed a tremendous increase in the enhancement. The optimized device shows exceptionally promising abilities regarding the enhancement, while the estimated cost of production and use is low. Such properties paired with low price and ease of usage could enable the NMS to become one of the leading methods of enhancement in Raman and infrared spectroscopy with the spatial resolution towards nanometers.