Prof. Lijun Wu Profile

Prof. Lijun Wu

at South China Normal Univ

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Proceedings Article | 2 January 2018 Paper

Orientation sensors by defocused imaging of single gold nano-bipyramids

Fanwei Zhang, Qiang Li, Wenye Rao, Hongjin Hu, Ye Gao, Lijun Wu

Proceedings Volume 10456, 104564W (2018) https://doi.org/10.1117/12.2283374

KEYWORDS: Polarization, Gold, Nanoparticles, Luminescence, Sensors, Anisotropy, Image sensors, Optical sensors, Quantum efficiency

Read Abstract +

Optical probes for nanoscale orientation sensing have attracted much attention in the field of single-molecule detections. Noble metal especially Au nanoparticles (NPs) exhibit extraordinary plasmonic properties, great photostability, excellent biocompatibility and nontoxicity, and thereby could be alternative labels to conventional applied organic dyes or quantum dots. One type of the most interesting metallic NPs is Au nanorods (AuNRs). Its anisotropic emission accompanied with anisotropic shape is potentially applicable in orientation sensing. Recently, we resolved the 3D orientation of single AuNRs within one frame by deliberately introducing an aberration (slight shift of the dipole away from the focal plane) to the imaging system¹ . This defocused imaging technique is based on the electron transition dipole approximation and the fact that the dipole radiation exhibits an angular anisotropy. Since the photoluminescence quantum yield (PLQY) can be enhanced by the “lightning rod effect” (at a sharp angled surface) and localized SPR modes, that of the single Au nano-bipyramid (AuNB) with more sharp tips or edges was found to be doubled comparing to AuNRs with a same effective size². Here, with a 532 nm excitation, we find that the PL properties of individual AuNBs can be described by three perpendicularly-arranged dipoles (with different ratios). Their PL defocused images are bright, clear and exhibit obvious anisotropy. These properties suggest that AuNBs are excellent candidates for orientation sensing labels in single molecule detections.

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