研究目的
Investigating the spectroscopic evidence of Bloch Surface Waves (BSWs) in the mid-infrared range for biosensing applications.
研究成果
Clear spectroscopic evidence of BSW excitation in the mid-IR on ZnS/CaF2 multilayers directly evaporated on CaF2 prisms was observed. The study demonstrates the potential for SPP-like biosensing applications in the mid-IR fingerprint range 3 to 10 μm.
研究不足
The experimental error bars have not yet allowed for a final statement on design accuracy, indicating the need for a laser spectroscopy setup based on quantum cascade lasers with high collimation of the optical beam and θ?2θ rotating arms to proceed further.
1：Experimental Design and Method Selection:
The study involved the development of thin-film deposition technology on CaF2 prisms and the use of FTIR spectroscopy to observe BSWs.
2：Sample Selection and Data Sources:
ZnS/CaF2 multilayers were directly grown on CaF2 prisms.
3：List of Experimental Equipment and Materials:
A custom variable internal-reflection angle setup built into the sample compartment of a FTIR spectrometer (Bruker Vertex 70v) was used.
4：Experimental Procedures and Operational Workflow:
The beam exiting the interferometer was passed through an iris with
5：5 mm clear aperture to select a quasi-collimated beam entering the prism on the oblique facet. Data Analysis Methods:
The data were analyzed to identify dips in the total internal reflectance spectra, attributed to BSW excitation.
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