Enhancement of magnetic dipole emission at yellow light in optical metamaterials

• We demonstrate the control of magnetic dipole spontaneous emission at yellow light by magnetic metamaterials.
• We have sandwiched grating metamaterials to enhance the spontaneous emission of magnetic dipole transition around 590 nm.
• We obtained 180 times magnetic dipole near-field enhancement and 110 times far-field enhancement near metamaterials structure in visible spectrum.

Here we demonstrate the control of magnetic dipole spontaneous emission at yellow light by magnetic metamaterials. By embedding magnetic dipole into a magnetic metamaterial consisting of arrays of paired silver strips, the radiative emission enhancement and the Purcell factor around 590 nm has been dramatically increased to 110 and 180 respectively. Moreover, the enhancements are found to be robust to variation of dipole's positions and structure geometries, showing nice fabrication tolerance for practical applications.