研究目的
To demonstrate lasing based on surface stimulated Raman scattering (SSRS) by creating an oriented, constrained Si–O–Si monolayer on the surface of integrated silica optical microresonators.
研究成果
Surface stimulated Raman lasing is demonstrated by grafting a highly oriented organic monolayer on an integrated ultra-high-Q optical microcavity. The ordered asymmetric monolayers allow for significant improvements in Raman lasing efficiency and demonstrate polarization-dependent behaviour, confirming the origin of the Raman emissions from the monolayer. This work opens new avenues for probing nanoscale properties of optical molecules and investigating quantum light–matter interactions.
研究不足
The study is limited by the precision of surface chemistry required to maintain the orientation of the vibrational Raman mode without degrading the optical performance of the resonator. Additionally, the study focuses on specific organic siloxane monolayers, which may not be representative of all potential surface chemistries.
1：Experimental Design and Method Selection:
The study combines surface chemistry and integrated photonics to demonstrate SSRS emission. Organic siloxane single-molecule layers are grafted onto the surface of a toroidal optical microresonator, resulting in a highly oriented Si–O–Si vibrational surface Raman mode.
2：Sample Selection and Data Sources:
Silica toroidal whispering-gallery-mode resonators integrated on silicon are used as the optical resonator. Two different device sizes are investigated.
3：List of Experimental Equipment and Materials:
A 765-nm tunable laser is coupled into the cavity using a single-mode tapered fibre waveguide. The Raman emission characteristics are recorded on an optical spectrum analyser.
4：Experimental Procedures and Operational Workflow:
The TE and TM modes of the optical cavity are selectively excited by changing the polarization of the input optical light. The lasing threshold and slope efficiency are determined by analysing the change in first-order Raman lasing power as a function of the coupled power and the polarization state.
5：Data Analysis Methods:
The Raman shift values are calculated and compared across devices. The efficiency and threshold power are measured to quantify the SSRS behaviour.
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