研究目的
Investigating the monolithic integration of arrays of microtubular vertical resonators on photonic waveguides for optofluidic applications.
研究成果
Arrays of ultra-compact 3D microtubular vertical optical ring resonators have been monolithically integrated onto on-chip polymer waveguides. The integrated system demonstrates remarkable extinction ratios and excellent optical coupling between the vertical tube resonators and the waveguides. Optofluidic functionality is demonstrated by observing spectral shifts of the resonance modes when the tubes are filled or covered with a liquid. This study represents a novel platform for optofluidic biological/chemical detection and analysis in extremely small analyte volumes.
研究不足
The sensitivity of the integrated system is smaller than that reported for isolated microtubes. There is an unavoidable decrease in the extinction ratio and Q-factor when the tubes are filled with water or covered with a liquid droplet due to optical absorption loss. Additional integration processing for pumping liquid into and out of the tube is needed for perfect optofluidic lab-on-a-chip applications.
1：Experimental Design and Method Selection:
The study involves the monolithic integration of 3D vertically rolled-up microtube ring resonators (VRU-MRRs) with polymer waveguides on a nanophotonic chip. The VRU-MRRs are fabricated by rolling up 2D differentially strained TiO2 nanomembranes into 3D microtubular cavities.
2：Sample Selection and Data Sources:
The samples include arrays of VRU-MRRs integrated with polymer waveguides. Data is collected through optical transmission measurements at telecom wavelengths.
3：List of Experimental Equipment and Materials:
The equipment includes a tunable infrared laser (1,500-1,600 nm), lensed fibers for coupling light into the waveguides, and a polarization controller. Materials include TiO2 nanomembranes and polymer waveguides.
4：Experimental Procedures and Operational Workflow:
The process involves fabricating the VRU-MRRs, integrating them with waveguides, and performing optical transmission measurements to observe whispering-gallery modes (WGMs). Optofluidic functionality is demonstrated by filling the tubes with water or covering them with a liquid droplet and observing spectral shifts in the WGMs.
5：Data Analysis Methods:
The spectral shifts of the WGMs are analyzed to determine the sensitivity of the system to changes in the refractive index of the surrounding medium.
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