Switching dynamics in InP photonic-crystal nanocavity

doi:10.1007/s12200-016-0577-4

Front. Optoelectron.

2016, Vol. 9

Issue (3) : 395-398 https://doi.org/10.1007/s12200-016-0577-4

RESEARCH ARTICLE

Switching dynamics in InP photonic-crystal nanocavity

Yi YU(

),Evarist PALUSHANI,Mikkel HEUCK,Leif Katsuo OXENLØWE,Kresten YVIND,Jesper MØRK

Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark

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Abstract

In this paper, we presented switching dynamic investigations on an InP photonic-crystal (PhC) nanocavity structure using homodyne pump-probe measurements. The measurements were compared with simulations based on temporal nonlinear coupled mode theory and carrier rate equations for the dynamics of the carrier density governing the cavity properties. The results provide insight into the nonlinear optical processes that govern the dynamics of nanocavities.

Keywords all-optical switching photonic-crystal (PhC) nanocavity nonlinear optics

Corresponding Author(s): Yi YU

Just Accepted Date: 03 August 2016 Online First Date: 12 September 2016 Issue Date: 28 September 2016

Cite this article:

Yi YU,Evarist PALUSHANI,Mikkel HEUCK, et al. Switching dynamics in InP photonic-crystal nanocavity[J]. Front. Optoelectron., 2016, 9(3): 395-398.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0577-4
https://academic.hep.com.cn/foe/EN/Y2016/V9/I3/395

Fig.1 Transmission spectrum of H0 cavity structure in linear case (blue dots) and theoretical fitting using a Lorentzian function (red curve). The inset shows a SEM image of PhC sample. The scale bar corresponds to 2 mm

Fig.2 Input and output pump spectra for different input powers and two polarizations. The probe is absent. (a) The pump is TE-polarized tuned to the cavity resonance; (b) the pump is TE-polarized and is blue detuned by 0.2 nm from the cavity resonance; (c) the pump is TM-polarized and is blue detuned by 0.2 nm from the cavity resonance. The discrete lines located on the spectra is due to modulation

Fig.3 Normalized output spectra for an input pump signal modulated at (a) 10 GHz and (b) 625 MHz, respectively, with different pulse energies. The input pump signal is tuned to the cavity resonance (blue dashed lines). The spectral curves have been smoothed so the discrete tones due to modulation have been removed

Fig.4 Measured (dots) and simulated (lines) probe transmission versus pump-probe delay for different pump energies and two probe locations. The transmission was normalized to one when the probe (~9 ps) preceded the pump (~5−6 ps). The pump wavelength was fixed at 1545 nm. The red and green lines and dots correspond to the switch-on case while the blue line and dot correspond to the switch-off case

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