The effect of periodic spatial perturbations on the emission rates of quantum dots near graphene platforms

Document Type

Article

Publication Date

8-1-2020

Abstract

The quenching of fluorescence (FL) at the vicinity of conductive surfaces and, in particular, near a 2-D graphene layer has become an important biochemical sensing tool. The quenching is attributed to fast non-radiative energy transfer between a chromophore (here, a Quantum Dot, QD) and the lossy graphene layer. Increased emission rate is also observed when the QD is coupled to a resonator. Here, we combine the two effects in order to control the emission lifetime of the QD. In our case, the resonator was defined by an array of nano-holes in the oxide substrate underneath a graphene surface guide. At resonance, the surface mode of the emitted radiation is concentrated at the nano-holes. Thus, the radiation of QD at or near the holes is spatially correlated through the hole-array's symmetry. We demonstrated an emission rate change by more than 50% as the sample was azimuthally rotated with respect to the polarization of the excitation laser. In addition to an electrical control, such control over the emission lifetime could be used to control Resonance Energy Transfer (RET) between two chromophores.

Identifier

85090224867 (Scopus)

Publication Title

Materials

External Full Text Location

https://doi.org/10.3390/MA13163504

e-ISSN

19961944

Issue

16

Volume

13

Grant

DE-AC02-06CH11357

Fund Ref

U.S. Department of Energy

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