Use of tunable second-harmonic signal from KNbO3 nanoneedles to find optimal wavelength for deep-tissue imaging
2014 (English)In: Laser & Photonics reviews, ISSN 1863-8880, E-ISSN 1863-8899, Vol. 8, no 6, 865-874 p.Article in journal (Refereed) Published
Nonlinear optical (NLO) responses of perovskite-type nanostructures have a variety of potential applications owing to the highly efficient frequency conversion guaranteed by both the material itself and the nanometer-scale configuration. KNbO3 (KN) nanoneedles have been identified as a promising NLO material because of the superior broadband frequency conversion efficiency, and if incident light is propagating in a direction perpendicular to the axis of a nanoneedle, then the phase-matching constraint can be relaxed. Here, the second-harmonic generation (SHG) and third-harmonic generation (THG) responses of both individual and clustered KN nanoneedles are reported. Based on these results, a novel method is proposed for determining the optimal excitation wavelength for NLO imaging of several biological samples, with KN nanoneedles acting as NLO agents. The method is shown to provide the optical features in the focal plane and a more reliable estimation of the optimal excitation wavelength for deep-tissue imaging.
Place, publisher, year, edition, pages
2014. Vol. 8, no 6, 865-874 p.
deep-tissue imaging, nonlinear optics, KNbO3 nano-needles, SHG, THG
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-157611DOI: 10.1002/lpor.201400009ISI: 000344649100005ScopusID: 2-s2.0-84923762979OAI: oai:DiVA.org:kth-157611DiVA: diva2:771150
QC 201510052014-12-122014-12-112015-10-05Bibliographically approved