Ultra-violet (UV) fluorescence lifetime modification by aluminum (Al) and magnesium (Mg) nanoapertures are reported in this manuscript. Nanoapertures with diameter ranging from 30nm to 90nm are fabricated using focused ion beam (FIB). Largest lifetime reduction are observed for apertures with smallest diameters and undercuts into glass substrate. For Al nanoapertures, largest lifetime reduction is ∼5.30×, larger than perviously reported ∼3.50×.1 For Mg nanoapertures, largest lifetime reduction is ∼6.90×, which is the largest lifetime reduction of UV fluorescence dye reported so far in literature. The dependence of count rate per molecule (CRM) on aperture size and undercut is also investigated, revealing that CRM increases with increasing undercut, however, the CRM is small (less than 2) for the entire range of aperture size and undercut we investigated. FDTD simulation were conducted and in order to favorably compare experimental results with simulated results, it is critical to take into account the exact shape and material properties of the nano aperture. Simulation results revealed the fundamental difference between Al and Mg nano aperture under 266nm illumination-Mg nano aperture presents a waveguide mode in which the maximum field enhancement and Purcell factor is within the nano aperture instead of on the surface which is the case for Al nano aperture.
Yunshan Wang, Xiaojin Jiao, Eric M. Peterson, Joel M. Harris, Kanagasundar Appusamy, Sivaraman Guruswamy, and Steve Blair, "UV fluorescence lifetime modification by aluminum and magnesium nanoapertures," Proc. SPIE 9926, UV and Higher Energy Photonics: From Materials to Applications, 99260I (Presented at SPIE Nanoscience + Engineering: August 29, 2016; Published: 15 September 2016); https://doi.org/10.1117/12.2237873.
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