Multiphoton excitation of quantum dots by ultrashort and ultraintense laser pulses
2006 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 88, no 22, 221114-1-221114-3 p.Article in journal (Refereed) Published
Multiphoton optical processes in semiconductor quantum dots (QDs) excited by ultrafast (femtosecond) and ultraintense (GW/cm(2)) lasers are considered as the ultimate tags for cellular bioimaging. By solving the time-dependent Schrodinger 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 3.7 nm in radius by a 100 fs laser pulse with a 10 GW/cm(2) peak optical power. The excitation rate is almost constant between 1300 and 560 nm, a useful region for bioimaging.
Place, publisher, year, edition, pages
2006. Vol. 88, no 22, 221114-1-221114-3 p.
Cadmium sulfide; Medical imaging; Photons; Ultrashort pulses; Bioimaging; Multiphoton excitation; Optical transitions
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-8235DOI: 10.1063/1.2209209ISI: 000238001900014ScopusID: 2-s2.0-33744789161OAI: oai:DiVA.org:kth-8235DiVA: diva2:13500
QC 201007302008-04-182008-04-182010-07-30Bibliographically approved