Abstract
Through analysis of the dispersion relation in a photonic bandgap structure, the effective optical Kerr non-linearity that determines a Z-scan profile particularly near the stop-band edges, is derived. Near and inside the stop band, the nonlinear optical phase change that originates from an off-resonant response is converted into a change in nonlinear optical intensity through Bragg reflection. The Z-scan measurement of a cholesteric liquid-crystal photonic bandgap structure confirmed that off-resonant Kerr nonlinearity is responsible for the characteristic open-aperture Z-scan profiles near the stop-band edges.
Original language | English |
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Pages (from-to) | 875-877 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 30 |
Issue number | 8 |
DOIs | |
State | Published - 15 Apr 2005 |