研究目的
Investigating the tunability of stimulated laser emission from dye doped chiral microdroplets in the presence of nitric acid molecules.
研究成果
The presence of acid molecules inside the droplets causes a change in the SRB shape and a shift in the dye fluorescence spectral position, leading to a shift of the stimulated laser emission of about 60 nm. This effect could be used for the development of a Nile Red based spectroscopy microsystem able to detect polarity changes in a liquid environment.
研究不足
The effect is difficult to control due to the challenge of relating the observed shift to the effective quantity of acid inside the droplets. The use of extremely small amounts of weak acids or biological compounds for fine tuning was not investigated.
1：Experimental Design and Method Selection:
The study involved preparing a dye doped cholesteric liquid crystal mixture and creating an emulsion by dispersing it in glycerol. The effect of nitric acid on the optical properties and laser emission of the microdroplets was investigated.
2：Sample Selection and Data Sources:
The materials used included BL036 as nematic host, MLC-6247 as chiral dopant, and Nile Red as fluorescent dye. Nitric acid was used to lower the pH of the mixture.
3：List of Experimental Equipment and Materials:
A Q-switched Nd:YAG laser was used as the pumping source, and an optical fiber spectrometer was used for analysis.
4：Experimental Procedures and Operational Workflow:
The emulsion was stirred to form microdroplets, and the effect of nitric acid on the laser emission was studied by adding different amounts of acid to the emulsion.
5：Data Analysis Methods:
The spectral properties and laser emission wavelengths were analyzed using an optical fiber spectrometer.
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