Acta Optica Sinica, Volume. 26, Issue 9, 1404(2006)
Research on TwoPhoton Absorption Enhancement in OneDimensional Photonic Crystals with Double Defect Modes
Onedimensional photonic crystals with two CdS defect layers which had two defect modes of 762 nm and 800 nm was fabricated by vacuum deposition process. Two-photon absorption coefficient was investigated by pumpprobe measurement. The twophoton absorption coefficient was enhanced at two defect modes. 307 cm/GW twophoton absorption coefficient at defect mode of 800 nm was greater than 116 cm/GW at defect mode of 762 nm and they were 48 and 18 times as large as that of a single CdS thin film. The enhancement of twophoton absorption coefficients was due to the enhanced electric field intensity ascribed to light localization in the two CdS defect layers. The transfer matrix method was used to calculate the internal electric field intensity in the onedimensional photonic crystal sample. It was found that the electric field intensity in defect layers at defect mode of 800 nm was larger than that of 762 nm.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Research on TwoPhoton Absorption Enhancement in OneDimensional Photonic Crystals with Double Defect Modes[J]. Acta Optica Sinica, 2006, 26(9): 1404