Broad-Band Chiral Reflectors based on Nano-Structured Biological Materials
نویسندگان
چکیده
In this work we study the reflection of circularly polarised light from a nano-structured biological material found in the exocuticle of scarabus beetles. This material is made of a stack of ultra-thin (~5 nm) uniaxial layers arranged in a left-handed helicoidal stack, which resonantly reflects circularly polarized light. A chirp in the layer thickness combined with a finite absorption coefficient produce a broad smooth reflectance spectrum. By comparing model calculations and electron microscopy with measured spectra we can explain our observations and quantify most relevant structural parameters. Keywords—Chiral reflectors, circularly polarised light, helicoidal structures, nano photonics.
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