Experimental verification of numerically optimized photonic crystal injector, Y-splitter, and bend

M Ayre, T J Karle, L J Wu, T Davies, T F Krauss

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23 Citations (Scopus)


We present the experimental measurement of a photonic crystal (PhC) device comprising an injector, Y-splitter, and 60 degrees bend. The complete device consists of a 9-mu m-long injector tapering down from 5 pin into a triangular-lattice-of-holes single-line defect waveguide with period a = 430 mn and 36.2% air filling factor (corresponding to a radius over period (r/a) ratio of 0.30), an optimized Y-junction, 60 degrees bend and output injectors, with a total device footprint of 30 mu m. This is etched into a GaAs/AlGaAs heterostructure using chlorine/argon chemically assisted ion beam etching (CAME). An erbium-doped fiber amplifier (EDFA)-based source and Fabry-Perot technique are used to characterize the device. The device displays a bandwidth of approximately 110 nm in the 1.55 mu m window, and a transmission of 70% relative to the same length of 5-mu m-wide waveguide. This is compared with three-dimensional finite-difference time-domain (3-D FDTD) results, which have a bandwidth and transmission of 120 nm and 75%, respectively. The highlight of this paper is the close agreement of the numerically optimized complete microcircuit with its experimental equivalent, and the significant improvement in bandwidth over previous work on Y-junctions.

Original languageEnglish
Pages (from-to)1390-1395
Number of pages6
JournalIEEE Journal on Selected Areas in Communications
Publication statusPublished - Jul 2005


  • chemically assisted ion beam etching (CAIBE)
  • Fabry-Perot resonance
  • input coupling
  • numerical optimization
  • photonic crystals (PhCs)
  • SLAB


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