Publication record
Multi-photon excitation of quantum dots by ultra-short and ultra-intense laser pulses
| Title | Multi-photon excitation of quantum dots by ultra-short and ultra-intense laser pulses |
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| Authors | Y. Fu, T.-T. Han, Y. Luo and H. Ågren |
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| Citation | Appl. Phys. Lett. vol.88, p.221114(3), 2006 |
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| Doi: | |
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| Year | 2006 |
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| Field | Solid state electronics and photonics |
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| Section | Solid state photonics |
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| Sub-section | Light sources |
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| Keywords | quantum dot, multiphoton absorption |
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| Abstract | Multiphoton optical processes in semiconductor quantum dots (QDs) excited by ultra-fast (fs) and ultra-intense (GW/cm2) lasers are considered as the ultimate tags for cellular bio-imaging. By solving the time-dependent Schrödinger equation unperturbatively, experimentally observed strong multiphoton excitation is reproduced when optical transitions among all confined states and a few hundred more extended states are taken into account. Model calculations indicate a significant excitation of a CdS QD of 37 nm in radius by a 100-fs laser pulse with a 10-GW/cm2 peak optical power. The excitation rate is almost constant between 1300 and 560 nm, a useful region for bio-imaging. |
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