研究目的
To use plasmonic structures as an enhancement for surface chemistry sensing with SHG, specifically for detecting minute changes at solid/liquid interfaces such as battery electrodes.
研究成果
Plasmonic structures significantly enhance SHG signals, enabling the detection of minute changes at solid/liquid interfaces. This method shows promise for in-situ and in-operando monitoring of chemical changes in closed cells, with potential applications in battery research and bioanalytical purposes.
研究不足
The technique's sensitivity is dependent on the plasmonic structures' ability to enhance SHG signals, and the method may require optimization for different interfaces or solvents.
1：Experimental Design and Method Selection:
Utilized plasmonic structures milled in a gold electrode to enhance SHG signals for monitoring changes at the liquid/electrode interface.
2：Sample Selection and Data Sources:
Used a specific homebuilt cell to monitor changes at the liquid/electrode interface with dimethoxyethane (DME) as the solvent.
3：List of Experimental Equipment and Materials:
Included a mode-locked tunable Ti:Sapphire laser, plasmonic structures milled in gold, and a custom-designed cell for solvent measurements.
4：Experimental Procedures and Operational Workflow:
Conducted SHG measurements with and without exposure to ambient conditions to detect water traces in DME.
5：Data Analysis Methods:
Analyzed SHG responses to assess changes at the interface, utilizing polarization-resolved acquisitions and spectral analysis.
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Ti:Sapphire laser
Spectra-Physics Mai-Tai HP
Spectra-Physics
Used for generating SH signal in the experiment.
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half-wave plate
HWP
Thorlabs
Used for rotating the incident polarization angle.
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polarizing beam splitter
PBS
Thorlabs
Used for separating the emitted SH signal into two different detection channels with orthogonal polarization components.
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inverted microscope
IX73 series
Olympus
Used for directing the fundamental laser light into the sample.
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objective lens
50×
Olympus
Used for allowing plasmonic excitation and collection of the emitted signal.
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piezo positioning stage
XY positioning series
Piezosystem
Used for raster scanning the sample surface to collect SH intensity maps.
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avalanched photodiodes
APD
Laser Components
Used for detection of the SHG signal.
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dichroic mirror
DM
Chroma
Used for spectrally separating the fundamental excitation beam from the emitted SHG signal.
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short-pass and band-pass filters
SPF and BPF
Semrok
Used for further spectral filtration of the fundamental beam, two-photon excited fluorescence (TPEF) and other two-photon processes.
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spectrograph
Shamrock 303i
Used for measuring the emitted spectrum signal.
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EMCCD camera
Andor Newton
Used for detecting the emitted spectrum signal.
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