Abstract
Over the last decade, plasmonic metamaterials have been investigated as new artificial nanostructures to exhibit a variety of electromagnetic responses and light-matter interaction, which have not been found in any synthetic material produced in nature. To achieve novel optical properties not attainable so far, realization of artificial magnetic atoms has been an issue in metamaterials [1]. On the other hand, revived attention was paid to the natural trivalent lanthanide ions such as Eu3+ and Er3+ due to their strong magnetic dipole (MD) transitions at optical wavelengths [2]. As for Eu3+ ions, it was reported that enhancement and suppression of the spontaneous visible emissions coming from electric dipole (ED) and MD transitions were controlled by electric local density of states (E-LDOS) and magnetic LDOS (M-LDOS), respectively. It is significant in telecommunication technology to enhance emission intensity in Er3+ ions, associate with Purcell effect.
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