Article

Applied Physics B

, Volume 99, Issue 3, pp 519-524

First online:

A broadband reflector using a multilayered grating structure with multi-subpart profile

  • H. WuAffiliated withState Key Laboratory of Advanced Optical Communication Systems and Networks, Peking UniversityWuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology
  • , J. HouAffiliated withState Key Laboratory of Advanced Optical Communication Systems and Networks, Peking UniversityWuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology
  • , W. MoAffiliated withState Key Laboratory of Advanced Optical Communication Systems and Networks, Peking UniversityWuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology
  • , D. GaoAffiliated withWuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology
  • , Z. ZhouAffiliated withState Key Laboratory of Advanced Optical Communication Systems and Networks, Peking UniversitySchool of Electrical and Computer Engineering, Georgia Institute of Technology Email author 

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Abstract

In this paper, a broadband reflector exhibiting a flattened bandstop spectral response is proposed by using a multilayered grating structure possessing multi-subpart profile. It is shown that with the properly configured profile and a strongly modulated grating layer, in transverse electric (TE) polarized wave the presented reflector experimentally demonstrated a 240 nm-wide reflection spectrum from 1.56 to 1.8 μm, very high reflectivity (>97%), and a low sensitivity to incident angle at the range of −13.8°<θ<+14°. Effects of deviation from the design parameters on the performance of the reflector are also illustrated, and a reasonably good tolerance of fabrication error is exhibited in the proposed device.