Investigation of Germanium-Loaded Slot Waveguides for Mid-Infrared Third Harmonic Generation
- 72 Downloads
In this paper, we propose a metal-semiconductor-metal slot waveguide (MSMSW) for producing mid-infrared (MIR) light from 10.2 μm by means of third harmonic generation (THG). In this waveguide, the required interaction length is limited by the large Ohmic loss, and therefore, perfect phase-matching condition (PMC) which ensures long coherent length is not necessary. Without the limitation of perfect PMC, the THG interaction mainly occurs between two fundamental modes at pump and harmonic wavelength, respectively leading to high nonlinear coefficient. According to our simulation, the conversion up to ~ 9.1 × 10−4 can be achieved within micron-scale waveguide under 1 W pump power. Furthermore, the waveguide demonstrates both large fabrication error and wavelength shift tolerance. The proposed waveguide can be a promising candidate for MIR light generation with large integration capability.
KeywordsIntegrated optics devices Third harmonic generation Nonlinear optical signal processing
This work was supported by the National Natural Science Foundation of China (61605179), the Ministry of Education of Singapore, Academic Research Fund Tier 2 (MOE2014-T2-1-076), the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (162301132703, and G1323511665), and the 863 High Technology Plan (2015AA015502).
- 2.Capasso F, Paiella R, Martini R, Colombelli R, Gmachl C, Myers TL, Taubman MS, Williams RM, Bethea CG, Unterrainer K, Hwang HY, Sivco DL, Cho AY, Sergent AM, Liu HC, Whittaker EA (2002) Quantum cascade lasers: ultrahigh-speed operation, optical wireless communication, narrow linewidth, and far-infrared emission. IEEE J Quantum Electron 38:511–532CrossRefGoogle Scholar
- 18.Huang T, Shao X, Wu Z, Lee T, Wu T, Sun Y, Zhang J, Lam HQ, Brambilla G, Shum PP (2014) Efficient third-harmonic generation from 2 μm in asymmetric plasmonic slot waveguide. IEEE Photon. J. 6:4800607Google Scholar
- 24.Chen Z, Song X, Jiao R, Duan G, Wang L, Yu L (2015) Tunable electromagnetically induced transparency in plasmonic system and its application in nanosensor and spectral splitting. IEEE Photon J 7:4801408Google Scholar