Influence of Substrate on Plasmon-Induced Absorption Enhancements

Abstract

A set of periodic plasmonic nanostructures is designed and fabricated as a means to investigate light absorption in single-crystal silicon thin-film structures with siliconon-insulator (SOI) wafers as a model system. It is shown both computationally and experimentally that plasmon-induced absorption enhancement is remarkably higher for such devices than for thick or semi-infinite structures or for the thin-film amorphous silicon solar cells reported in the literature. Experimental photocurrent enhancements of the orders of 12 and 20 are demonstrated for non-optimized 2200-nm-thick photoconductive and 300-nm-thick photovoltaic test structures, respectively. Theoretical absorption enhancements as high as 80 are predicted to be achievable for the similar structures. The features of the spectral enhancements observed are attributed to several interacting resonance phenomena: not just to the favourable scattering of light by the periodic plasmonic nanoparticle arrays into the SOI device layer and coupling to the waveguide modes interacting with the plasmonic array but also to the Fabry-Pérot type interferences in the layered structure. We show that the latter effect gives a significant contribution to the spectral features of the enhancements, although frequently ignored in the discussions of previous reports.

Optical properties of mesoporous photonic crystals, filled with dielectrics, ferroelectrics and piezoelectrics

“…Such properties open the wide field for applications. [29][30][31][32][33][34] One way for it is the filling of mesoporous photonic crystals void by different substances, including liquids, ferroelectrics, etc. Mesoporous photonic crystals may be explored as selective filters in laser resonators and in devices for registration of spontaneous and stimulated Raman scattering.…”

Dynamically tunable multi-band plasmon-induced absorption based on multi-layer borophene ribbon gratings

“…[24][25][26] Plasmon-induced absorption (PIA) and plasmon-induced reflection (PIR) are an analog of the PIT effect. [27][28][29] Traditional PIA effects based on metal and dielectric structures are difficult to adjust after production, and the reflection window of PIA is difficult to tune. An important characteristic of 2D materials is that they can tune conductivity by applying an electrostatic field or chemical doping.…”

Simple thermal control of dc low-current amplifiers improves stability

“…We report on the improvements achieved with the thermostat of the gain and offset stability of a popular commercial transresistance amplifier, FEMTO mod. DDPCA-300, often employed (not thermostated) in nanoscience [6][7][8][17][18][19][20][21][22] and other experimental fields involving low-current measurements [23][24][25][26][27][28].…”