In situ tuning of a photonic band gap with laser pulses
- Autori: Pasquazi, A; Stivala, S; Assanto, G; Amendola, V; Meneghetti, M; Cucini, M; Comoretto, D
- Anno di pubblicazione: 2008
- Tipologia: Articolo in rivista (Articolo in rivista)
- Parole Chiave: Photonic crystals; optical tuning
- OA Link: http://hdl.handle.net/10447/49275
Abstract
We report on light-induced optical tuning of colloidal photonic crystals doped with gold nanoparticles (Au-nps). By resonantly exciting the Au-np surface plasmon absorption with picosecond pulses at 0.53 micron in a standard pump-probe setup, we observed permanent changes in the stop band resonance around 1.7 micron, with blue wavelength shifts as large as 30 nm and associated to a nanoparticle reshaping. Fine tuning was achieved by controlling either the pulse energy or the irradiation time.