Volume 3 Issue 4
Sep.  2010
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SHOU Xiang, GAN Ben-xin, SU Hong-yan, BAI Lu-guang. Optical switching based on magnetic resonance of split ring resonator array[J]. Chinese Optics, 2010, 3(4): 385-390.
Citation: SHOU Xiang, GAN Ben-xin, SU Hong-yan, BAI Lu-guang. Optical switching based on magnetic resonance of split ring resonator array[J]. Chinese Optics, 2010, 3(4): 385-390.

Optical switching based on magnetic resonance of split ring resonator array

  • Received Date: 15 Mar 2010
  • Rev Recd Date: 13 May 2010
  • Publish Date: 25 Aug 2010
  • We demonstrate an all-optical switching of the magnetic resonance properties associated with a metallic Split Ring Resonator(SRR) array. The periodically spaced elements are fabricated on a high-resistivity silicon wafer and probed by using conventional Terahertz(THz) time-domain spectroscopy. We use a continuous-wave laser diode to generate carriers in the gaps of the SRR elements. Using a sufficient power, this optical excitation can create an effective short gap, which would switch the resonant properties of the metamaterial from that of an SRR array to that of a closed ring resonator array and leads to dramatic changes in the THz transmission. In the present experiment, the optically induced switching is associated with the magnetic resonance. However, with appropriate changes in the device structure, this approach can be extended to switch a medium with a negative real index of refraction to a medium with a positive real index of refraction. This opens the way to creat a broad new range of active devices.

     

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