Nonlinear optical processes in optically trapped InP nanowires
We report on the observation of nonlinear optical excitation and related photoluminescence from single InP semiconductor nanowires held in suspension using a gradient force optical tweezers. Photoexcitation of free carriers is achieved through absorption of infrared (1.17 eV) photons from the trappi...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Chemical Society
2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/25261/1/Nonlinear%20optical%20processes%20in%20optically%20trapped%20InP%20nanowires.pdf http://psasir.upm.edu.my/id/eprint/25261/ http://pubs.acs.org/doi/abs/10.1021/nl2020262 |
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| Institution: | Universiti Putra Malaysia |
| Language: | English |
| Summary: | We report on the observation of nonlinear optical excitation and related photoluminescence from single InP semiconductor nanowires held in suspension using a gradient force optical tweezers. Photoexcitation of free carriers is achieved through absorption of infrared (1.17 eV) photons from the trapping source via a combination of two- and three-photon processes. This was confirmed by power-dependent photoluminescence measurements. Marked differences in spectral features are noted between nonlinear optical excitation and direct excitation and are related to band-filling effects. Direct observation of second harmonic generation in trapped InP nanowires confirms the presence of nonlinear optical processes. |
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