Description |
Light control and modulation have applications in many different science and
engineering fields. It would be interesting to note that one of the earliest
proposals for anti-reflection coatings was by Lord Rayleigh in 1880. From
then, the so called quarter wave stacks, graded index materials and more
recently nanostructured materials were demonstrated as anti-reflection
coatings. However, one proposal which has not been experimentally realized is
the optical reflectionless potential. In this talk, I will mainly focus on our
results on refractive index profiles conforming to reflectionless potentials.
These structures show broadband, polarization and launch angle independent
suppression of reflection. In addition to this property, they show negative
group index over broad band. Consequences include superluminal transmission
and pulse compression. If time permits, I will show results on light
modulation and light harvesting using metamaterials.
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