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Volumn 86, Issue 15, 2012, Pages

Measurement of a band-edge tail in the density of states of a photonic-crystal waveguide

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EID: 84868152443     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.86.155154     Document Type: Article
Times cited : (35)

References (49)
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    • Localized modes in photonic-crystal waveguides are known to be narrow-band. In Fig. we show the wavelength dependence of two such modes (1 and 2) with a resolution of Δλ=0.1 nm. In Fig. we observe that the periodic pattern is perturbed at the locations of the arrows at λ=948.5 nm. In Fig. we observe the localized mode at λ=948.6 nm, where the perturbations extend maximally in the surrounding photonic crystal. In Fig., at λ=948.7 nm, the localized modes are suppressed. At λ=948.9 nm the localized modes have completely vanished (not shown). This demonstrates that these localized modes have a linewidth of Δλ 0.2 nm, corresponding to Q∼103-104. We have observed ∼102 localized modes and they fully extend within a range of typically Δλ<0.5 nm. The observed linewidths should be considered the upper limit for the true resonance widths, since near-field tips are known to shift and broaden resonances.
    • Localized modes in photonic-crystal waveguides are known to be narrow-band. In Fig. we show the wavelength dependence of two such modes (1 and 2) with a resolution of Δ λ = 0.1 nm. In Fig. we observe that the periodic pattern is perturbed at the locations of the arrows at λ = 948.5 nm. In Fig. we observe the localized mode at λ = 948.6 nm, where the perturbations extend maximally in the surrounding photonic crystal. In Fig., at λ = 948.7 nm, the localized modes are suppressed. At λ = 948.9 nm the localized modes have completely vanished (not shown). This demonstrates that these localized modes have a linewidth of Δ λ 0.2 nm, corresponding to Q ∼ 10 3 - 10 4. We have observed ∼ 10 2 localized modes and they fully extend within a range of typically Δ λ < 0.5 nm. The observed linewidths should be considered the upper limit for the true resonance widths, since near-field tips are known to shift and broaden resonances.
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