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

Area of Science:

• Nanotechnology
• Optics
• Materials Science

Background:

• Whispering gallery mode resonators (WGMRs) are crucial for various optical applications.
• Surface functionalization of WGMRs is key to enhancing their performance, particularly their quality (Q) factor.
• Quantum dots (QDs) offer unique nanomaterial properties for modifying optical devices.

Purpose of the Study:

• To investigate the functionalization of WGMR surfaces using quantum dots.
• To evaluate the impact of QD deposition on the Q factor of WGMRs.
• To demonstrate the suitability of QD-functionalized WGMRs for nonlinear optical processes like third-harmonic generation.

Main Methods:

• Surface functionalization of WGMRs with HgS and PbS quantum dots.
• Characterization of the Q factor of the modified microresonators.
• Experimental demonstration of third-harmonic generation using the functionalized WGMRs.

Main Results:

• Successful functionalization of WGMR surfaces with thin layers of HgS and PbS quantum dots.
• Achieved high Q factors in the developed microresonators.
• Demonstrated efficient third-harmonic generation, requiring significantly lower pumping power.

Conclusions:

• Quantum dot functionalization is an effective strategy to enhance WGMR performance.
• QD-modified WGMRs show great potential for low-power nonlinear optical applications.
• The high Q factor achieved is critical for enabling efficient third-harmonic generation.