6533b85efe1ef96bd12bfc3b
RESEARCH PRODUCT
Quantum Dots Luminescence Collection Enhancement and Nanoscopy by Dielectric Microspheres
Francesco BiccariFrancesco BiccariMassimo GurioliMassimo GurioliTravis HamiltonHooman MohseniSergio BiettiStefano SanguinettiAndrea RistoriAndrea Ristorisubject
Materials sciencePhotoluminescencebusiness.industrynear fieldNear and far fieldGeneral ChemistryDielectricPhotonic nanojetCondensed Matter PhysicsMicrosphereQuantum dotphotonic nanojetmicrosphereOptoelectronicsGeneral Materials SciencephotoluminescencebusinessLuminescenceFIS/03 - FISICA DELLA MATERIAdescription
In recent years, dielectric microspheres have been used in conjunction with optical microscopes to beat the diffraction limit and to obtain superresolution imaging. The use of microspheres on quantum dots (QDs) is investigated, for the first time, to enhance the light coupling efficiency. The enhancement of the QD luminescence collection in terms of extraction and directionality is demonstrated, as well as the enhancement of spatial resolution. In particular, it is found that a dielectric microsphere, placed on top of an epitaxial QD, increases the collected radiant energy by about a factor of 42, when a low numerical aperture objective is used. Moreover, if two or more QDs are present below the microsphere, the modification of the far field emission pattern allows selective collection of the luminescence from a single QD by simply changing the collection angle. Dielectric microspheres present a simple and efficient tool to improve the QD spectroscopy, and potentially QD-based devices.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-12-15 |