Such structures are also found in nature (for example, in green - winged teal feathers and in some butterfly wings) and are known
as photonic crystals.
In B. pavonina, however, this stacking is far more regular, creating what are known
as photonic crystals.
Zheng Wang and colleagues at the Massachusetts Institute of Technology have made what's known
as a photonic crystal from an array of ferrite rods.
These images depict how the photonic sensor translates finger movements into color changes,
as the photonic crystal reacts to the change in local humidity caused by the approach of the finger without direct contact.
This leaves behind a porous, weblike polymer structure, which now acts
as the photonic crystal.
Not exact matches
Tiny, mirrorlike structures known
as distributed Bragg reflectors reflect this fluorescent light
as well
as all the other light the
photonic crystal allows to pass through.
«It is particularly refreshing to see simple techniques such
as inkjet printing being used to such great effect,» says Thomas Krauss who investigates
photonic crystals at the University of York.
For example,
photonic crystals could funnel excess heat from a power plant's generator and release it over a much smaller band of frequencies to drive engines — such
as those in electric - powered cars that can absorb energy only within a small range — much more efficiently.
In packed, two - dimensional crystalline systems, such
as in
photonic two - dimensional
crystals, the particles are organized in hexagonal lattices.
Left - bottom: Variation of quantum dot emission line frequencies
as a function of time due to vibrations of the
photonic crystal membrane.
In this case, Lu was able to calculate precise measurements for the construction of a
photonic crystal predicted to produce the manifestation of Weyl points — with dimensions and precise angles between arrays of holes drilled through the material, a configuration known
as a gyroid structure.
American researchers have now used a
photonic crystal as a reflector for a miniature microwave antenna which could one day be fabricated on a single chip along with control electronics.
EPFL scientists have now fabricated and experimentally tested a silicon - based «
photonic crystal nanocavity» (PCN) that requires an unprecedentedly low amount of energy to operate
as a switch.
We also propose the fabrication of 1D
photonic crystal and microcavities employing a magneto - optical material
as TGG (Tb3Ga5O12).