研究目的
Investigating the detection of photo-thermal transient stress with high sensitivity at the sub-nanosecond timescale using a sub-nanosecond pump probe system with surface plasmon resonance.
研究成果
The Kretschmann SPR sensor demonstrated high sensitivity in detecting transient photo-thermal stress at the sub-nanosecond timescale. This technique shows potential for non-invasive high-resolution 3D PAM by enabling functional imaging of small biomedical samples.
研究不足
The time resolution of the system is limited by the pulse width of the sub-nanosecond laser, which may not capture the original transient response form accurately without deconvolution.
1：Experimental Design and Method Selection:
A sub-nanosecond pump-probe system was designed to investigate the detection sensitivity of a Kretschmann SPR sensor for photo-thermal transient stress. The system utilized a sub-nanosecond pulsed laser for both pump and probe beams.
2：Sample Selection and Data Sources:
The SPR sensor comprised an Ag metal film on a BK7 glass prism. The Ag film was deposited by electron-beam evaporation.
3：List of Experimental Equipment and Materials:
The system included a sub-nanosecond pulse laser, polarized beam splitter, mechanical light chopper, automatic delay line, LBO crystal for second-harmonic generation, dichroic mirror, half mirror, variable beam splitter, objective lens, focus lens, and balanced detector.
4：Experimental Procedures and Operational Workflow:
The pump and probe beams were separated and their optical powers adjusted. The pump beam was modulated and its delay time controlled. The probe beam's wavelength was converted, and its light was focused on the SPR sensor. The reflected light was detected to observe stress signals.
5：Data Analysis Methods:
The stress signal from the pump beam was obtained by a lock-in amplifier, and the reflectivity changes in the probe beam were observed under SPR and non-SPR conditions.
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Herios 1064-5-50
1064-5-50
Coherent Inc.
Sub-nanosecond pulse laser for pump and probe beams
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Objective lens
PAL-20-NIR-HR-LC00
Sigma Koki Co., Ltd.
Focuses the probe beam on the SPR sensor
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Polarized beam splitter
Separates the pump and probe beams
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Mechanical light chopper
5584A
NF Corp.
Modulates the pump beam
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LBO crystal
LBO-402
Eksma Optics
Second-harmonic generation for wavelength conversion of the probe beam
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Balanced detector
1607-AC-FS
Newport Corp.
Detects the reflected light of the probe beam
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Lock-in amplifier
LI5660
NF Corp.
Obtains the stress signal from the pump beam
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