Abstract
We present a technique based on the selective liquid infiltration of photonic crystal (PhC) waveguides to produce very small dispersion slow light over a substantial bandwidth. We numerically demonstrate that this approach allows one to control the group velocity (from c/20 to c/110) from a single PhC waveguide design, simply by choosing the index of the liquid to infiltrate. In addition, we show that this method is tolerant to deviations in the PhC parameters such as the hole size, which relaxes the constraint on the PhC fabrication accuracy as compared to previous structural-based methods for slow light dispersion engineering.
Highlights
In recent years, there has been a growing interest in slow light planar photonic crystal (PhC) waveguides both in the context of optical delay lines and more generally for nonlinear optics [1,2,3]
We present a technique based on the selective liquid infiltration of photonic crystal (PhC) waveguides to produce very small dispersion slow light over a substantial bandwidth
We show that this method is tolerant to deviations in the PhC parameters such as the hole size, which relaxes the constraint on the PhC fabrication accuracy as compared to previous structural-based methods for slow light dispersion engineering
Summary
There has been a growing interest in slow light planar photonic crystal (PhC) waveguides both in the context of optical delay lines and more generally for nonlinear optics [1,2,3]. It is important to realize slow-light structures with tailored nearly dispersionless properties This has been recently achieved by engineering the geometry of the PhC waveguide [8,9,10,11,12], resulting in sophisticated designs that typically require nanometerscale technological precision. Selective liquid infiltration within individual air pores of a planar PhC lattice has been recently investigated, extending the number of opportunities associated to this optofluidic platform [19,20,21,22,23] This offers the potential for realizing integrated microphotonic devices and circuits which could be (re)configured by changing the liquid and/ or the pattern of the infiltrated area within the PhC lattice [19, 20, 23,24,25]
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