Method for producing bandwidth tunable slow light in polymer filling photonic crystal slot waveguide

Abstract

The invention provides a method for producing bandwidth tunable slow light in a polymer filling photonic crystal slot waveguide. According to the method for producing the bandwidth tunable slow light in the polymer filling photonic crystal slot waveguide, the characteristics of slow light in the photonic crystal slot waveguide are optimized through the adjustment of the positions of air holes in two sides of an air slot, when a group refractive index is 55, the wavelength range, namely the bandwidth, of a smooth slow light area can reach 9.0nm, when the group refractive index is 100, the wavelength range, namely the bandwidth, of the smooth slow light area can reach 3.5nm, when the group refractive index is 172.5, the wavelength range, namely the bandwidth, of the smooth slow light area can reach 1.1nm, when the group refractive index is 222, the wavelength range, namely the bandwidth, of the smooth slow light area can reach 0.8nm, and for example, when 0V driving voltage, or 2V driving voltage, or 4V driving voltage, or 6V driving voltage, or 8V driving voltage, or 10V driving voltage is applied to slow light with the group refractive index of 100 and the bandwidth of 3.5nm respectively, the central operating wavelength of the slow light is 1562nm, 1560.5nm, 1559nm, 1557.5nm, 1556nm, and 1554.5nm respectively. Meanwhile, when the group refractive index is between 90 and 110, the bandwidth of the slow light is increased to 111nm, and the bandwidth tunable slow light is achieved.

Description

technical field [0001] The invention relates to a method for generating broadband tunable slow light in a polymer-filled photonic crystal groove waveguide, and belongs to the technical field of micro-optoelectronic device design. Background technique [0002] Photonic crystals, also known as optical semiconductors, are new artificial materials formed by periodic arrangements of substances with different dielectric constants on the scale of light wavelengths. Its unique photonic band gap and photon localization characteristics enable people to manipulate The movement of photons becomes possible [Document 1. A. Scherer, O. Painter, J. Vuckovic, M. Loncar, and T. Yoshie. Photonic crystals for confining, guiding, and emitting light. IEEE Transactions on Nanotechnology, 2002, 1( 1): 4-11.]. A line defect is introduced in the photonic crystal along the direction of light propagation to form a photonic crystal waveguide. At this time, the photonic crystal waveguide will be affecte...

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Problems solved by technology

In addition, when the external environment changes or there is an error in the preparation process, it is easy to cause a change in the characteristics of the slow light or a shift in its working wavelength [Document 9. H. Aghababaeian, M. H. Vadjed-Samiei, N. Granpayeh. "Temperature stabilization of group index in silicon photonic crystal waveguides.” Journal of the Optical Society of Korea, 2011, 15(4): 398-402; Literature 10. W. W. Song, R. A. Integlia, and W. Jiang. Slow light loss due to roughness in photonic crystal waveguides : An analytic approach [J]. Physical Review B, 2010, 82(3): 235306.], these will seriously limit the application range of photonic crystal slot waveguide slow light

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