The scientific manuscript was published on MDPI Nanomaterials webpage with contributors from RTU Institute of Telecommunications – Armands Ostrovskis, Toms Salgals, Arvids Sedulis, Sandis Spolitis and Vjaceslavs Bobrovs .
What is the paper about?
Quantum dots can modify the properties of the whispering gallery mode resonators
(WGMRs) used in various potential applications. A deposition of a suitable nanomaterial for the
surface functionalization of WGMRs allows for the achievement of high quality (Q) factors. Here,
we show that the WGMR surface can be functionalized using quantum dots. We demonstrate that
WGMRs covered with thin layers of HgS and PbS quantum dots are suitable for third-harmonic
generation due to the high Q factor of the developed microresonators, thus significantly lowering the
pumping power required for nonlinear optical interactions.
What are the conclusions?
The surface of the WGMR was functionalized with quantum dots to enhance its optical
properties. The functionalization of microresonators was explored by finding the optimal
conditions for the deposition of thin layers of HgS and PbS quantum dots. The coated
WGMRs preserved the OFC generation and allowed a lower-order harmonic generation.
We demonstrated that WGMRs covered with a thin layer of quantum dots are suitable for
third-harmonic generation due to their ultra-high Q factors, thus significantly lowering
the pumping power required for the nonlinear optical interactions. It was shown that
some THG spectra were produced through the cascaded second-harmonic generation and
sum-frequency generation.
The copy of the manuscript can be found on the MDPI Webpage.
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