Theoretical analysis for optomechanical all-optical transistor

doi:10.1007/s12200-016-0601-8

Front. Optoelectron.

2016, Vol. 9

Issue (3) : 406-411 https://doi.org/10.1007/s12200-016-0601-8

RESEARCH ARTICLE

Theoretical analysis for optomechanical all-optical transistor

Mengying HE,Shasha LIAO,Li LIU,Jianji DONG(

)

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

In this paper, we propose an on-chip all optical transistor driven by optical gradient force. The transistor consists of a single micro-ring resonator, half of which is suspended from the substrate, and a bus waveguide. The free-standing arc is bent by optical gradient force generated when the control light is coupled into the ring. The output power of the probe light is tuned continuously as the transmission spectrum red-shift due to the displacement of the free-standing arc. The transistor shows three working regions known as cutoff region, amplified region and saturate region, and the characteristic curve is tunable by changing the wavelength of the control light. Potential applications of the all optical transistor include waveform regeneration and other optical computing.

Keywords silicon photonics optical gradient force optical transistor

Corresponding Author(s): Jianji DONG

Just Accepted Date: 19 August 2016 Online First Date: 06 September 2016 Issue Date: 28 September 2016

Cite this article:

Mengying HE,Shasha LIAO,Li LIU, et al. Theoretical analysis for optomechanical all-optical transistor[J]. Front. Optoelectron., 2016, 9(3): 406-411.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0601-8
https://academic.hep.com.cn/foe/EN/Y2016/V9/I3/406

Fig.1 (a) Schematic illustration of an all optical transistor driven by optical gradient force; (b) transmission spectra at a lower control power and red-shift at a higher control power; (c) illustration of the characteristic curve of the optical transistor which includes three parts: cutoff region, amplified region and saturate region

Fig.2 (a) Illustration of the vertical optical gradient force; (b) simulation of the effective refractive index as a function of the air gap; (c) the shift of the resonant wavelength as a function of the displacement; (d) comparison of optical force and mechanical force under different power of the control light; (e) nonlinear relation between the displacement of the arc and the power of the control light; (f) transmission spectra of the ring resonator under different power of the control light

Fig.3 (a) Relation between normalized output power and the input optical power of the control light under different wavelength detuning ?l; (b) nonlinear relation between the displacement of the arc and the input optical power of the control light under different wavelength detuning ?l; (c) illustration of the characteristic curve of the optical transistor while the wavelength detuning ?l= 0.1 nm

Fig.4 (a) Transmission spectra of the ring resonator under different gaps; (b) comparison of optical force and mechanical force under different gaps while the power of the control light is 2 mW and the wavelength detuning ?l is 0.05 nm; (c) relation between normalized output power and the input optical power of the control light under different gaps

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