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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 2246–2254

Ultrathin broadband nearly perfect absorber with symmetrical coherent illumination

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

Optics Express, Vol. 20, Issue 3, pp. 2246-2254 (2012)

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As highlighted by recent articles [Phys. Rev. Lett. 105, 053901 (2010) and Science 331, 889-892 (2011)], the coherent control of narrowband perfect absorption in intrinsic silicon slab has attracted much attention. In this paper, we demonstrate that broadband coherent perfect absorber (CPA) can be achieved by heavily doping an ultrathin silicon film. Two distinct perfect absorption regimes are derived with extremely broad and moderately narrow bandwidth under symmetrical coherent illumination. The large enhancement of bandwidth may open up new avenues for broadband applications. Subsequently, interferometric method is used to control the absorption coherently with extremely large contrast between the maximum and minimum absorptance. Compared with the results in literatures, the thin film CPAs proposed here show much more flexibility in both operation frequency and bandwidth.

© 2012 OSA

OCIS Codes
(310.3915) Thin films : Metallic, opaque, and absorbing coatings
(160.3918) Materials : Metamaterials
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Thin Films

Original Manuscript: November 16, 2011
Revised Manuscript: December 22, 2011
Manuscript Accepted: December 23, 2011
Published: January 17, 2012

Mingbo Pu, Qin Feng, Min Wang, Chenggang Hu, Cheng Huang, Xiaoliang Ma, Zeyu Zhao, Changtao Wang, and Xiangang Luo, "Ultrathin broadband nearly perfect absorber with symmetrical coherent illumination," Opt. Express 20, 2246-2254 (2012)

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