Investigation of Nonlinear Optical Processes in Mercury Sulfide Quantum Dots

Abstract

The authors report the third-harmonic generation, nonlinear refraction, and nonlinear absorption in HgS quantum dot (QD) suspensions and films using the nanosecond and femtosecond pulses. High conversion efficiency (7 × 10−4) towards the third harmonic (TH) of the 900–1700 nm, 150 fs laser in the thin (70 nm) films containing HgS QDs deposited on the glass substrates is obtained. The authors analyze spectral dependencies of the TH, nonlinear refractive indices, and nonlinear absorption coefficients of QDs in the 500–1700 nm range and discuss the relation between the TH process and the low-order nonlinear optical properties of these quantum dots.

Quantum-Dot-Induced Modification of Surface Functionalization for Active Applications of Whispering Gallery Mode Resonators

“…The relatively high conversion efficiency towards the third harmonic of the 900-1700 nm 150 fs pulses in the thin (70 nm) film containing HsS QDs deposited on the glass substrates has earlier been reported in [17]. The intensity, polarization, and spectral dependencies of this process in HgS QD thin film have been analyzed.…”

“…The details of the synthesis of HgS and PbS QDs were described elsewhere [ 17 , 18 ]. The initial concentrations of the quantum dot colloidal solutions were approximately similar (≈4 × 10 −5 M).…”