The European Physical Journal B

, Volume 77, Issue 1, pp 147–152 | Cite as

Emergence of semi-localized Anderson modes in a disordered photonic crystal as a result of overlap probability*

  • A. R. Hashemi
  • M. Hosseini-Farzad
  • Afshin Montakhab
Mesoscopic and Nanoscale Systems


In this paper we study the effect of positional randomness on transmissional properties of a two dimensional photonic crystal as a function of a randomness parameter α (α = 0 completely ordered, α = 1 completely disordered). We use finite-difference time-domain (FDTD) method to solve the Maxwell’s equations in such a medium numerically. We consider two situations: first a 90° bent photonic crystal wave-guide and second a centrally pulsed photonic crystal micro-cavity. We plot various figures for each case which characterize the effect of randomness quantitatively. More specifically, in the wave-guide situation, we show that the general shape of the normalized total output energy is a Gaussian function of randomness with wavelength-dependent width. For centrally pulsed PC, the output energy curves display extremum behavior both as a function of time as well as randomness. We explain these effects in terms of two distinct but simultaneous effects which emerge with increasing randomness, namely the creation of semi-localized modes and the shrinking (and eventual destruction) of the photonic band-gaps. Semi-localized (i.e. Anderson localized) modes are seen to arise as a synchronization of internal modes within a cluster of randomly positioned dielectric nano-particles. The general trend we observe shows a sharp change of behavior in the intermediate randomness regime (i.e. α 0.5) which we attribute to a similar behavior in the underlying overlap probability of nano-particles.


Photonic Crystal Output Energy Randomness Factor FDTD Method Random Laser 
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Supplementary material


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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • A. R. Hashemi
    • 1
  • M. Hosseini-Farzad
    • 1
  • Afshin Montakhab
    • 1
  1. 1.Department of PhysicsCollege of Sciences, Shiraz UniversityShirazIran

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