研究目的
Investigating the third order nonlinear optical properties of DNA-based biopolymers thin films doped with selected natural chromophores.
研究成果
The study demonstrates that DNA-based biopolymers doped with natural chromophores exhibit large third order NLO susceptibilities, comparable or higher than synthetic counterparts. The largest susceptibility was found for curry leaves extract. These materials show promise for applications in photonics due to their large optical damage thresholds and biodegradability.
研究不足
The study is limited to the specific natural chromophores and biopolymers used. The optical properties may vary with different chromophores or matrices. The THG technique measures only the electronic origin third order NLO susceptibility, and other contributions may be present but not measured.
1：Experimental Design and Method Selection:
The study involved the preparation of thin films of DNA-based biopolymers doped with natural chromophores extracts (sweet paprika, turmeric, curry leaves) using spin coating on glass substrates. The nonlinear optical properties were measured using the optical third harmonic generation technique at 1064.2 nm fundamental wavelength.
2：2 nm fundamental wavelength.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Natural chromophores were extracted from sweet paprika, turmeric, and curry leaves. DNA and DNA-CTMA complex were used as matrices. Thin films were prepared by three different methods (A, B, C) involving dissolution in various solvents.
3：List of Experimental Equipment and Materials:
Thermo SCIENTIFIC EVOLUTION 220 UV-Visible spectrophotometer for absorption spectra, Q switched Nd:YAG laser (Quantel, model Brillant) for THG measurements, Laurell-Model WS-400B-6NPP/LITE spin coating apparatus, KLA Tencor D-120 profilometer for thickness measurement.
4：Experimental Procedures and Operational Workflow:
Thin films were prepared by spin coating, dried overnight at 60 °C in a vacuum oven. THG measurements were performed with the sample mounted on a goniometer, rotating along an axis perpendicular to the incident beam.
5：Data Analysis Methods:
The third order NLO susceptibility was calculated by comparing the harmonic intensity generated in the thin film and the substrate, using known values for the substrate's susceptibility.
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