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One of our nano studies has been
focused to ‘photonic crystals (PC)’, which are periodic dielectric
structures. Just like electrons experience forbidden energy
gaps in a semiconductor crystal due to a periodic coulomb potential
in the photonic crystals could also ‘feel’ unallowed photonic
bandgaps (PBG) due to the periodicity in dielectric constant.
Our aims are to study the basic physical properties of photonic
crystals and photonic bandgaps, and to build functional photonic
integrated circuits based on these unusual properties.
Nano patterning for 2-dimensional photonic crystals are done
by laser holography e-beam direct writing. For 3-dimensional
photonic crystals, we are interested in the self-assembly of
silica nanoballs into the fcc structure. For theoretical understandings,
bandgap calculations as well as simulations on light propagation
are investigated using plane-wave expansion and FDTD methods. |
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