研究目的
Investigating the combination of vertical Ge PIN photodetectors with metallic nanostructures for high sensitivity refractive index sensing in integrated biosensing applications.
研究成果
The study demonstrates that heterostructure Ge PIN photodetectors combined with plasmonic nanostructures can be used for integrated refractive index sensing with high sensitivity. The semiconductor material itself can act as a tuning parameter for device performance, and the photocurrent can detect surface refractive index changes without signal amplification circuitry.
研究不足
The study is a proof-of-principle demonstration, and further device downscaling is needed for detecting small sample volumes down to the single molecule level.
1：Experimental Design and Method Selection:
The study combines vertical Ge PIN photodetectors with metallic nanostructures like Al nanohole arrays to explore their interaction for refractive index sensing.
2：Sample Selection and Data Sources:
Ge heterostructure PIN photodetectors with plasmonic nanostructures were used, submerged in liquids with different refractive indices for testing.
3：List of Experimental Equipment and Materials:
Ge PIN photodetectors, Al nanohole arrays, liquids with varying refractive indices.
4：Experimental Procedures and Operational Workflow:
Devices were submerged in liquids, and responsivity spectra were measured to observe shifts in plasmon resonance wavelength.
5：Data Analysis Methods:
The sensitivity S = Δλ/ΔnSup was calculated from the shift in plasmon resonance wavelength due to changes in superstrate refractive index.
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