Chinese Optics Letters, 2018, 16 (5): 050008, Published Online: Jul. 4, 2018  

Enhancing magnetic dipole emission with magnetic metamaterials Download: 883次

Author Affiliations
State Key Laboratory of Tunable Laser Technology, Ministry of Industry and Information Technology, Key Laboratory of Micro-Nano Optoelectronic Information System, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
Abstract
Magnetic dipole (MD) transitions are important for a range of technologies from quantum light sources and displays to lasers and bio-probes. However, the typical MD transitions are much weaker than their electric counterparts and are usually neglected in practical applications. Herein, we experimentally demonstrate that the MD transitions can be significantly enhanced by the well-developed magnetic metamaterials in the visible optical range. The magnetic metamaterials consist of silver nanostrips and a thick silver film, which are separated with an Eu3+:polymethyl methacrylate (PMMA) film. By controlling the thickness of the Eu3+:PMMA film, the magnetic resonance has been tuned to match the emission wavelength of MDs. Consequently, the intensity of MD emission has been significantly increased by around 30 times at the magnetic resonance wavelength, whereas the intensity of electric dipole emission is well-preserved. The corresponding numerical calculations reveal that the enhancement is directly generated by the magnetic resonance, which strongly increases the magnetic local density of states around the MD emitter and can efficiently radiate the MD emission into the far field. This is the first demonstration, to the best of our knowledge, that MD transitions can be improved by an additional degree of magnetic freedom, and we believe this research shall pave a new route towards bright magnetic emitters and their potential applications.

Shang Sun, Chen Zhang, Haitao Zhang, Yisheng Gao, Ningbo Yi, Qinghai Song, Shumin Xiao. Enhancing magnetic dipole emission with magnetic metamaterials[J]. Chinese Optics Letters, 2018, 16(5): 050008.

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