High refractive index dielectric nanoantennas strongly modify the decay rate via the Purcell effect through the design of radiative channels.Due to their dielectric nature,the field is mainly confined inside the nanos...High refractive index dielectric nanoantennas strongly modify the decay rate via the Purcell effect through the design of radiative channels.Due to their dielectric nature,the field is mainly confined inside the nanostructure and in the gap,which is hard to probe with scanning probe techniques.Here we use single-molecule fluorescence lifetime imaging microscopy(smFLIM)to map the decay rate enhancement in dielectric GaP nanoantenna dimers with a median localization precision of 14 nm.We measure,in the gap of the nanoantenna,decay rates that are almost 30 times larger than on a glass substrate.By comparing experimental results with numerical simulations we show that this large enhancement is essentially radiative,contrary to the case of plasmonic nanoantennas,and therefore has great potential for applications such as quantum optics and biosensing.展开更多
基金received financial support from the French Agence Nationale de la Recherche via the LABEX WIFI under ANR-10-LABX-24 and ANR-10 IDEX-0001-02 PSLthe ANR SiMpLeLIFe project ANR-17-CE09-0006+1 种基金the ANR MIPTIME project ANR-22-CE09-0030-02It has also received financial support from the UK Engineering and Physical Sciences Research Council(EPSRC)via the following grants:EP/P033369/1 and EP/P033431/1.S.A.M.also acknowledges the Lee-Lucas Chair in Physics.
文摘High refractive index dielectric nanoantennas strongly modify the decay rate via the Purcell effect through the design of radiative channels.Due to their dielectric nature,the field is mainly confined inside the nanostructure and in the gap,which is hard to probe with scanning probe techniques.Here we use single-molecule fluorescence lifetime imaging microscopy(smFLIM)to map the decay rate enhancement in dielectric GaP nanoantenna dimers with a median localization precision of 14 nm.We measure,in the gap of the nanoantenna,decay rates that are almost 30 times larger than on a glass substrate.By comparing experimental results with numerical simulations we show that this large enhancement is essentially radiative,contrary to the case of plasmonic nanoantennas,and therefore has great potential for applications such as quantum optics and biosensing.
