Istituto dei materiali per l'elettronica ed il magnetismo     
Zhao Z., Gao F., Peng R., Cao L., Li D., Wang Z., Hao X., Wang M., Ferrari C. Localization-delocalization transition of photons in one-dimensional random n-mer dielectric systems. In: Physical Review B, vol. 75 (16) article n. 165117. The American Physical Society, 2007.
In this work, we have both theoretically and experimentally investigated the photonic transmission in a one-dimensional random n-mer =RN dielectric system. Due to the positional correlation in the RN structure, the localization-delocalization transitions of photons happen at expected frequencies of photons. Multiple resonant transmissions are found in the photonic band gap. At each resonant mode, zero-Lyapunov exponent and undecayed field distribution of electromagnetic waves have been found through the whole system. Furthermore, the channel is opened for photonic transport at the resonant frequency, and the density of states of photons increases step by step as frequency increases. The theoretical results are experimentally demonstrated in RN dielectric multilayer films of SiO2 /TiO2 for visible and near infrared light.
URL: http://link.aps.org/abstract/PRB/v75/e165117
DOI: 10.1103/PhysRevB.75.165117
Subject silicon compounds
titanium compounds
dielectric thin films
photonic band gap
electronic density of states
visible spectra
infrared spectra
42.25.Dd Wave propagation in random media
42.70.Qs Photonic bandgap materials (for photonic crystal lasers, see 42.55.Tv)
61.43.-j Disordered solids (see also 81.05.Gc, 81.05.Kf, and 81.05.Rm in materials science; for photoluminescence of disordered solids, see 78.55.Mb and 78.55.Qr)

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