Near-perfect IR light absorption at multiple wavelengths has been experimentally demonstrated by using multiplexed metal square plasmonic resonance structures. Optical power absorption over 95% has been observed in dual-band metamaterial absorbers at two separate wavelengths, and optical power absorption over 92.5% has been observed in triple-band metamaterial absorbers at three separate wavelengths. The peak absorption wavelengths are primarily determined by the sizes of the metal squares in the multiplexed structures. Electrical field distributions in the middle of the dielectric spacer layer were calculated at the peak absorption wavelengths. It is found that the strong light absorption corresponds to local quadrupole plasmon resonance modes in the metamaterial structures.
© 2013 Optical Society of America
Original Manuscript: October 31, 2012
Revised Manuscript: January 3, 2013
Manuscript Accepted: January 28, 2013
Published: February 19, 2013
Boyang Zhang, Joshua Hendrickson, and Junpeng Guo, "Multispectral near-perfect metamaterial absorbers using spatially multiplexed plasmon resonance metal square structures," J. Opt. Soc. Am. B 30, 656-662 (2013)