研究目的
Investigating the second-order nonlinear optics induced by symmetry breaking at the surface of an ultrahigh-Q silica microcavity under a sub-milliwatt continuous-wave pump.
研究成果
The microcavity-enhanced optical nonlinearity resulting from symmetry breaking at a surface provides a new platform for surface science and applications, such as molecule detection under submilliwatt pump power. The dynamic phase-matching method is universal for surface nonlinear optics in various microcavity systems with different centrosymmetric materials.
研究不足
The study is limited by the challenge of achieving double resonances due to the ultra-narrow linewidth of ultrahigh Q microcavities. Additionally, the bulk multipole effects may disturb the deterministic study of surface properties.
1：Experimental Design and Method Selection:
The study leverages whispering-gallery microcavities for their ultrahigh Q factors and small mode volumes to enhance light-matter interactions, focusing on nonlinear optics. The experiment involves inducing second-order nonlinear optics through symmetry breaking at the microcavity surface.
2：Sample Selection and Data Sources:
A silica microsphere with a diameter of ~62 μm is used as the microcavity, pumped at 1555.14 nm to generate a second harmonic signal at 777.75 nm.
3：14 nm to generate a second harmonic signal at 75 nm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup includes a silica microsphere, a pump fiber, a signal fiber for collecting the second harmonic signal, an EMCCD for measuring the SH spectrum, and an optical spectrum analyzer (OSA) for the pump spectrum.
4：Experimental Procedures and Operational Workflow:
The experiment involves pumping the microcavity at different wavelengths to generate SH signals, optimizing fiber-cavity coupling for signal collection, and analyzing the SH power and its dependence on pump wavelength.
5：Data Analysis Methods:
The SH power is analyzed versus pump wavelength shift, and the efficiency of SH generation is compared between the pump and signal fibers.
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