High performance electro-optic modulator employing a thin BiFeO3 film on Au with absorption resonance

Qu, Tianliang; Song, Yongbo; Yang, Kaiyong; Huang, Yun; Wu, S.; Tan, Zhongqi; Long, Xingwu

doi:10.1364/oic.2013.mb.6

Cited by 1 publication

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“…Ferroelectric materials, such as bismuth ferrite (BiFeO 3 , BFO) or barium titanate (BaTiO 3 , BTO), possess promising features for optical modulation [39][40][41][42][43][44][45][46][47]. Under applied voltage, the ferroelectric domains can be partially reoriented from the in-plane orientation (with an ordinary refractive index n o ) to the out-of-plane orientation (with extraordinary index n e ) [48,49].…”

Section: Introductionmentioning

confidence: 99%

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Bismuth ferrite as low-loss switchable material for plasmonic waveguide modulator

Babicheva¹,

Zhukovsky²,

Lavrinenko³

2014

Opt. Express

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We propose new designs of plasmonic modulators, which can be utilized for dynamic signal switching in photonic integrated circuits. We study performance of plasmonic waveguide modulator with bismuth ferrite as an active material. The bismuth ferrite core is sandwiched between metal plates (metal-insulator-metal configuration), which also serve as electrodes so that the core changes its refractive index under applied voltage by means of partial in-plane to out-of-plane reorientation of ferroelectric domains in bismuth ferrite. This domain switch results in changing of propagation constant and absorption coefficient, and thus either phase or amplitude control can be implemented. Efficient modulation performance is achieved because of high field confinement between the metal layers, as well as the existence of mode cut-offs for particular values of the core thickness, making it possible to control the signal with superior modulation depth. For the phase control scheme, π phase shift is provided by 0.8-µm length device having propagation losses 0.29 dB/µm. For the amplitude control, we predict up to 38 dB/µm extinction ratio with 1.2 dB/µm propagation loss. In contrast to previously proposed active materials, bismuth ferrite has nearly zero material losses, so bismuth ferrite based modulators do not bring about additional decay of the propagating signal.

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Section: Introductionmentioning

confidence: 99%

“…However, BFO has higher birefringence with refractive index difference ∆n = 0.18 nearly three times higher than in BTO. Recently a strong change of refractive index in BFO was demonstrated [44] and proposed for electro-optic modulation [46][47].…”

Section: Introductionmentioning

confidence: 99%