Li Xianji, Bai Zhongchen, Peng Man, et al. Surface plasma enhanced fluorescence of CdSe quantum dots induced by laser on a grating surface[J]. Opto-Electronic Engineering, 2019, 46(5): 180464. doi: 10.12086/oee.2019.180464
Citation: Li Xianji, Bai Zhongchen, Peng Man, et al. Surface plasma enhanced fluorescence of CdSe quantum dots induced by laser on a grating surface[J]. Opto-Electronic Engineering, 2019, 46(5): 180464. doi: 10.12086/oee.2019.180464

Surface plasma enhanced fluorescence of CdSe quantum dots induced by laser on a grating surface

    Fund Project: Supported National Natural Science Foundation of China (61741505), Science and Technology Support Project by Guizhou Province (QKHZ[2017]2887), Central Guidance for Local Science and Technology Development Projects (QKZYD[2017]4004), and Talent Team Project of Guizhou Province ([2018]5616)
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  • The fluorescence enhancement effect of CdSe quantum dots (QDs) was measured by using a picosecond pulsed laser with a 532 nm excitation wavelength to induce surface plasmon (SP) on a gold nanograting surface. A layered thin film was prepared on the gold film surface of silicon fund by atomic force microscope (AFM) etching and self-assembly method, respectively. The fluorescence spectrum of CdSe QDs was measured by adjusting the power of picosecond pulsed laser on a micro-Raman measuring platform. The results showed that the structure of the gold nanograting and CdSe QDs could greatly enhance the far-field fluorescence of CdSe QDs, the maximum fluorescence intensity was up to 7.80 times, and it had been saturated rapidly at the point of reaching the maximum intensity. The results of this study could be widely used in fields of the optoelectronic devices, biomedical detection.
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  • Overview: In recent years, the fluorescence technology has been greatly developed, but in practical applications, the sensitivity of the existing fluorescence detection technology is not satisfactory. Semiconductor quantum dots can exhibit higher luminous efficiency and stronger brightness compared to conventional fluorescent dyes, and their emitted light wavelengths can cover almost the entire visible light region, thus, it has been widely used in bio-detection, biomarker and optoelectronic device development. However, the commonly used quantum dots tend to have low fluorescence emission intensity, and the fluorescence stability needs to be further improved, which greatly limits its application. Therefore, the technology based on surface plasmon enhanced quantum dots fluorescence has become a new method for reducing fluorescence noise and improving sensitivity, and it has developed rapidly for this reason.

    In the 1970s, Drexhage discovered the phenomenon of surface-enhanced fluorescence, but until the end of the 20th century, Lakowicz and his colleagues experimentally studied the effect of metal nanostructures on enhancing fluorescence, and made great contributions to the mechanism and application of surface-enhanced fluorescence, it begun to attract people's attention. And today, surface-enhanced fluorescence technology based on nanostructures has been widely used in the fields of DNA nondestructive testing, biosensing analysis, and single molecule detection. In recent years, research on the use of various metal nanostructures to enhance quantum dot fluorescence has also made a great progress. However, the mechanism of interaction between metal nanostructures and quantum dots is still not unified, and the control of coupling ligands between quantum dots and nanostructures is still one of the hot issues in current scientific research. In this paper, a nanograting structure was prepared on gold film surface of silicon fund by AFM force etching method, and CdSe quantum dots with organic molecular ligands were attached to the surface of nanograting by self-assembly technique. A multilayers film structure of nanograting/CdSe quantum dots were prepared. The fluorescence spectrum of the CdSe quantum dots was measured by adjusting the picosecond laser (with 532 nm excitation wavelengths) power on a micro-Raman measuring platform. The results showed that the structure of the gold nanograting and CdSe QDs could greatly enhance the far-field fluorescence of CdSe QDs, the maximum fluorescence intensity was up to 7.80 times, and it had been saturated rapidly at the point of reaching the maximum intensity. The results of this study could be widely used in fields of the optoelectronic devices, biomedical detection.

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