Quantifying the local density of optical states of nanorods by fluorescence lifetime imaging

Liu, Jing; Jiang, Xunpeng; Ishii, Satoshi; Shalaev, Vladimir M.; Irudayaraj, Joseph

doi:10.1088/1367-2630/16/6/063069

Cited by 9 publications

(7 citation statements)

References 49 publications

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“…When the QD to waveguide surface distance is less than 10 nm, non-radiative decay into metallic losses is prominent. Hence, the outcoupling intensity at the end is decreased and our observation is consistent with previously reported values [ 10 , 18 ]. After 30 nm, the distance between QD and waveguide surface increases and the QD is positioned far from the evanescent surface plasmon mode tail.…”

Section: Resultssupporting

confidence: 94%

Mapping bound plasmon propagation on a nanoscale stripe waveguide using quantum dots: influence of spacer layer thickness

Perera

Funston

Cheng

et al. 2015

Beilstein J. Nanotechnol.

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SummaryIn this paper we image the highly confined long range plasmons of a nanoscale metal stripe waveguide using quantum emitters. Plasmons were excited using a highly focused 633 nm laser beam and a specially designed grating structure to provide stronger incoupling to the desired mode. A homogeneous thin layer of quantum dots was used to image the near field intensity of the propagating plasmons on the waveguide. We observed that the photoluminescence is quenched when the QD to metal surface distance is less than 10 nm. The optimised spacer layer thickness for the stripe waveguides was found to be around 20 nm. Authors believe that the findings of this paper prove beneficial for the development of plasmonic devices utilising stripe waveguides.

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Section: Resultssupporting

confidence: 94%

Mapping bound plasmon propagation on a nanoscale stripe waveguide using quantum dots: influence of spacer layer thickness

Perera

Funston

Cheng

et al. 2015

Beilstein J. Nanotechnol.

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“…28 A Chameleon Ultra Ti-Sapphire tunable laser (Coherent Inc., California) operating in the range from 680 to 1080 nm was used as excitation. The laser beam was delivered onto the sample by a water-immersion objective (60× /1.20 NA, Olympus).…”

Section: Second-harmonic Imaging Microscopymentioning

confidence: 99%

Single-cell screening and quantification of transcripts in cancer tissues by second-harmonic generation microscopy

Liu

Damayanti²,

Cho

et al. 2015

J. Biomed. Opt

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Abstract. Fluorescence-based single molecule techniques to interrogate gene expression in tissues present a very low signal-to-noise ratio due to the strong autofluorescence and other background signals from tissue sections. This report presents a background-free method using second-harmonic generation (SHG) nanocrystals as probes to quantify the messenger RNA (mRNA) of human epidermal growth receptor 2 (Her2) at single molecule resolution in specific phenotypes at single-cell resolution directly in tissues. Coherent SHG emission from individual barium titanium oxide (BTO) nanoprobes was demonstrated, allowing for a stable signal beyond the autofluorescence window. Her2 surface marker and Her2 mRNA were specifically labeled with BTO probes, and Her2 mRNA was quantified at single copy sensitivity in Her2 expressing phenotypes directly in cancer tissues. Our approach provides the first proof of concept of a cross-platform strategy to probe tissues at single-cell resolution in situ.

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“…We hypothesize that the photon-induced carrier density on the graphene sheet dominates this energy transfer process. To prove this, we calculated the enhancement factors (γ R and γ NR ) of radiative decay rate (Γ R ) and nonradiative decay rate (Γ NR ) of individual NV centers, [57][58][59] as shown in Figure 5A,B. The graphene has relatively less influence on the radiative decay of affiliated NV centers, while it has a significant impact on the nonradiative decay behavior of NV centers in these nanodiamonds.…”

Section: Discussionmentioning

confidence: 95%

“…The arriving time of photons from NV center formed a TCSPC histogram, which was then fitted with a multiexponential decay function to obtain fluorescence lifetime. [58,59] For G2 measurements, a Hanbury Brown-Twiss (HBT) geometry was used to investigate the single photon emission property of nanodiamonds. In the HBT setup, photon current from one SPAD (SPAD1) was used as "Sync" and the photon current from the other SPAD (SPAD2) was connected to "start"; the second order correlation function G 2 (τ) = 〈I(t)I(t + τ)〉 /〈I(t)〉 2 was calculated via the correlation card "TimeHarp 200.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Energy Transfer from Nitrogen‐Vacancy Centers to Three‐Dimensional Graphene Heterostructures by Laser Nanoshaping

Liu

Kumar

et al. 2021

Advanced Optical Materials

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Graphene, a well‐studied 2D material, is used to tailor the emission behavior of proximal light emitters by controlling the energy flow to modulate the related relaxation rates, with potentials in fields of biosensing and photovoltaics. Good interface between emitters and 2D materials are important to efficiently modulate the photon emission behavior. However, seamless integration of quantum light emitters and atomically thin materials is challenging due to fabrication limitation. In this paper, the utilization of laser nanoshaping approaches to “wrap” the atomically thin graphene on nanodiamond particles is reported. Compared with 2D layout, the 3D integration enhances the energy transfer by 45%. Furthermore, it is found that the energy transfer efficiency of nitrogen‐vacancy (NV) centers to the 3D graphene can reach a maximum value of 80% over a long distance (≈25 nm), under intense laser excitation. The authors’ analysis indicates that the photon‐generated carrier density of graphene enhances the nonradiative decay rate of NV centers. Besides contributing new insight on the fundamentals of interactions between graphene and quantum emitters, the effort undertaken furthermore holds tremendous promise in developing the graphene‐based nano‐cavities for various applications ranging from sensing, to photovoltaics, to lasing, and to quantum communications.

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Quantifying the local density of optical states of nanorods by fluorescence lifetime imaging

Cited by 9 publications

References 49 publications

Mapping bound plasmon propagation on a nanoscale stripe waveguide using quantum dots: influence of spacer layer thickness

Mapping bound plasmon propagation on a nanoscale stripe waveguide using quantum dots: influence of spacer layer thickness

Single-cell screening and quantification of transcripts in cancer tissues by second-harmonic generation microscopy

Enhanced Energy Transfer from Nitrogen‐Vacancy Centers to Three‐Dimensional Graphene Heterostructures by Laser Nanoshaping

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