4:00 PM - 4:15 PM
[17p-A402-10] Collective plasmonic modes excited on Al nanocylinder array in the UV spectral region and enhancement of photoluminescence from Eu-complex thin film
Keywords:plasmon
In periodic arrays of metal nanocylinder with the periodicity comparable to the optical wavelengths, both surface plasmon polaritons (SPPs) and light diffraction can be excited simultaneously. The diffracted light propagating on the plane excites SPPs in phase, giving the net response that is stronger than the simple sum of each SPP. This hybrid mode thus excited is called collective plasmonic mode. While this collective mode has been studied in the visible region, the research on the UV region is missing due to the severer requirement for the fabrication precision of the structure. In the meantime, there is an increasing trend to extend the operation frequencies of plasmonics from the visible to the UV region which has potential applications such as UV SERS and photovoltaic.
In this study, we fabricated Al nanocylinder arrays with different pitch (periodicity (p): from 150 to 330 nm, height: 150 nm, diameter: from 80 to150 nm) by nanoimprint method on SiO2 glass substrate to observe the collective modes in the UV region for the first time. We selected Al, which is a highly promising material for commercial applications, because it is low cost, abundant in nature, and enables excitation of SPPs in the deep UV region.
We showed that UV light can be confined in the plane of the array, and the wavelengths of the confined light is tunable by controlling the period of the Al nanocylinder array. In addition, we deposited the luminescent layer of Eu complex on the array and observed enhanced photoluminescence by exciting the system with the UV laser.
In this study, we fabricated Al nanocylinder arrays with different pitch (periodicity (p): from 150 to 330 nm, height: 150 nm, diameter: from 80 to150 nm) by nanoimprint method on SiO2 glass substrate to observe the collective modes in the UV region for the first time. We selected Al, which is a highly promising material for commercial applications, because it is low cost, abundant in nature, and enables excitation of SPPs in the deep UV region.
We showed that UV light can be confined in the plane of the array, and the wavelengths of the confined light is tunable by controlling the period of the Al nanocylinder array. In addition, we deposited the luminescent layer of Eu complex on the array and observed enhanced photoluminescence by exciting the system with the UV laser.