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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 21 — Oct. 10, 2011
  • pp: 20642–20649

Truncated spherical voids for nearly omnidirectional optical absorption

Min Wang, Chenggang Hu, Mingbo Pu, Cheng Huang, Zeyu Zhao, Qin Feng, and Xiangang Luo  »View Author Affiliations

Optics Express, Vol. 19, Issue 21, pp. 20642-20649 (2011)

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Truncated spherical voids nanostructured tungsten films are shown to have nearly perfect absorption with characteristics of broad-band, polarization-independent and wide-incidence angle in near infrared and visible regime. Through optimizing material and structural parameters, we can achieve the absorbance above 90% from 420THz to 600THz within incidence angle from 0° to 60° for TE polarization and from 450THz to 800THz within incidence angle from 0° to 75° for TM polarization. In particular, absorbance can achieve 99.9% at 550.5THz for both polarizations under normal incidence. Such strong absorption is explained using multilayer effective media theory and cavity resonance.

© 2011 OSA

OCIS Codes
(160.0160) Materials : Materials
(260.3910) Physical optics : Metal optics

ToC Category:
Physical Optics

Original Manuscript: August 31, 2011
Manuscript Accepted: September 2, 2011
Published: October 3, 2011

Min Wang, Chenggang Hu, Mingbo Pu, Cheng Huang, Zeyu Zhao, Qin Feng, and Xiangang Luo, "Truncated spherical voids for nearly omnidirectional optical absorption," Opt. Express 19, 20642-20649 (2011)

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