研究目的
To identify the defects and investigate their distribution in periodically poled lithium niobate (PPLN), and to develop a new method of characterization for ferroelectric phononic crystals (FPC).
研究成果
The PL spectra of ZX-PPLN reveal a nonuniform distribution of point defects, with some defects showing narrow extrema in PL-intensity at the interdomain wall location. The spread in PL intensity from the average is significantly higher in PPLN compared to single crystal lithium niobate, indicating a periodic distribution of defects in PPLN. These findings may lead to new non-destructive characterization methods for ferroelectric phononic crystals.
研究不足
The study is limited to the analysis of point defects in ZX-cut PPLN at room temperature using photoluminescence spectroscopy. The findings may not be directly applicable to other crystal cuts or under different experimental conditions.
1：Experimental Design and Method Selection:
The study involves recording the spectra of photoluminescence (PL) from a ZX-cut PPLN plate to investigate the distribution of point defects.
2：Sample Selection and Data Sources:
A ZX-cut PPLN plate with 88 inversely poled domains was used.
3：List of Experimental Equipment and Materials:
A QuantamasterTM 400 Spectrofluorometer by Photon Technology International was used to record PL spectra.
4：Experimental Procedures and Operational Workflow:
The PL was excited by ultraviolet light from a Xenon arc lamp at room temperature, with the excitation monochromator set at 310 nm. The sample was moved in steps of tens of microns along the x-axis to record PL spectra from different positions.
5：Data Analysis Methods:
The PL spectra were analyzed to identify defects and their distribution, comparing results from PPLN and single crystal lithium niobate.
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