Tunable room-temperature single-photon emission at telecom wavelengths from sp3 defects in carbon nanotubes

He, Xiaowei; Hartmann, Nicolai F.; Ma, Xuedan; Kim, Young‐Hee; Ihly, Rachelle; Blackburn, Jeffrey L.; Gao, Weilu; Kono, Junichiro; Yomogida, Yohei; Hirano, Atsushi; Tanaka, Takeshi; Kataura, Hiromichi; Htoon, Han; Doorn, Stephen K.

doi:10.1038/nphoton.2017.119

Cited by 250 publications

(429 citation statements)

References 45 publications

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“…[32] In contrast, the other 20 trajectories only show deviations in the emission energies around the equilibrium (~2.3 eV) until the end of the simulation (at the final step of these 20 trajectories, the oscillator strengths of the S 1 -S 0 transitions are predicted to vary from 0.0772 to 0.1604, proving the optically allowed nature of the transitions; see Table S3 for details). [38,39] Figure 3 shows the results of a representative trajectory, which takes 188.5 fs to reach the CI point, at which the potential energy surfaces of S 1 and S 0 state almost cross and the S 1 -S 0 state energy difference is merely 0.14 eV (The structural evolution during the simulation of this trajectory can be found in Movie S1.). [37] It is predictable that such fast nonradiative decays can be a nonnegligible competitor to the radiative decay channels and thus affect the luminescent efficiencies of the materials.…”

Section: Resultsmentioning

confidence: 99%

Nonradiative Excited‐State Decay via Conical Intersection in Graphene Nanostructures

et al. 2019

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Chemical groups are known to tune the luminescent efficiencies of graphene-related nanomaterials, but some species, including the epoxide group (À COCÀ ), are suspected to act as emissionquenching sites. Herein, by performing nonadiabatic excitedstate dynamics simulations, we reveal a fast (within 300 fs) nonradiative excited-state decay of a graphene epoxide nanostructure from the lowest excited singlet (S 1 ) state to the ground (S 0 ) state via a conical intersection (CI), at which the energy difference between the S 1 and S 0 states is approximately zero. This CI is induced after breaking one CÀ O bond at the À COCÀ moiety during excited-state structural relaxation. This study ascertains the role of epoxide groups in inducing the nonradiative recombination of the excited electron-hole, providing important insights into the CI-promoted nonradiative deexcitations and the luminescence tuning of relevant materials. In addition, it shows the feasibility of utilizing nonadiabatic excited-state dynamics simulations to investigate the photophysical processes of the excited states of graphene nanomaterials. Computational DetailsThe ground-and excited-state properties were studied by density functional theory (DFT) and time-dependent DFT (TD-DFT), respectively, as implemented by the Gaussian 09[a] S.

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Section: Resultsmentioning

confidence: 99%

Nonradiative Excited‐State Decay via Conical Intersection in Graphene Nanostructures

et al. 2019

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“…For inter‐metropolitan fiber‐based quantum networks, telecom or near‐telecom wavelength emission is needed so as to take advantage of low‐loss transmission window granted by the silica optical fiber, which is probably the only financially affordable option for large‐scale deployment of long‐distance communication. The wavelength compatibility has been realized on multiple systems including emergent emitters in GaN, defects in SiC, doping of carbon nanotubes, and rare‐earth Er 3+ ions in solids, but not yet on split‐vacancy color centers, which require different techniques of frequency downconversion similar to those applied to semiconductor quantum dots . Secondly, mK cryogenic temperature operation on SiV − center is too costly and cumbersome for any practical usage of the long memory lifetime.…”

Section: Discussionmentioning

confidence: 99%

Building Blocks for Quantum Network Based on Group‐IV Split‐Vacancy Centers in Diamond

2019

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One ultimate goal of quantum information processing is to construct a quantum network for direct sharing of quantum information between distant parties based on stationary qubits for information storage and flying qubits for information transmission. This requires long‐lived quantum memories, efficient light–matter interface, and deterministic quantum gate operations. Among matter qubits, the electron spin of nitrogen vacancy center in diamond is an appealing option for its long coherence time at room temperature, deterministic microwave control, and optical preparation and readout of the qubit. However, its poor optical properties, including weak zero‐phonon‐line emission and large spectral diffusion, limit its potential for large‐scale deployment in quantum nodes. This has motivated the investigation for alternative quantum emitters that combine long‐time memory and coherent optical properties together. The emerging group‐IV split‐vacancy color centers in diamond, such as silicon‐vacancy, germanium‐vacancy, tin‐vacancy, and lead‐vacancy centers, are promising candidates of this ongoing exploration. These quantum emitters simultaneously possess microsecond spin coherence time and optically bright transitions with narrow linewidths. This review reports recent efforts on extending the spin coherence time of these color centers via temperature, strain, and charge control, which paves the road towards constructing solid‐based matter–photon interface for quantum network applications.

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“…For comparison, we also simulate the properties of the SPP waveguide modes when the silver nanowire is placed on a glass substrate (refractive index n glass = 1.5), and the simulation results are displayed in Figure b. Herein, the wavelength is set to be λ = 1310 nm . It should be stressed that the choice of this particular wavelength is arbitrary, and that the structural geometry can always be tuned to match the desired resonant wavelength in the nanoslit.…”

Section: Spp Waveguide Mode With Long Propagation Length and Without mentioning

confidence: 99%

“…The thickness of the silver and air in the simulation model are 300 and 2700 nm, respectively. The emission wavelength of the quantum emitter is set to be λ = 1310 nm . The quantum emitter oriented along the z ‐axis is chosen because its total emission rate is several dozen times that of the quantum emitters oriented along the x ‐ or y ‐axis .…”

Section: Brightening the Single‐photon Emission In The Waveguide–slitmentioning

confidence: 99%

“…If the average width of the unparalleled slit remains unchanged, the simulation shows that the influence of the unparalleled slit sides on the performance of the system is small. The room‐temperature single photon at telecom wavelength ( λ = 1310 nm) was also realized by using carbon nanotubes or PbS quantum dots . In our proposed structure, the optimal position is at the top region of the metallic nanoslit, where the quantum emitters are placed.…”

Section: Guiding the Single‐photon Emission In The Waveguide–slit Strmentioning

confidence: 99%

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Brightening and Guiding Single‐Photon Emission by Plasmonic Waveguide–Slit Structures on a Metallic Substrate

Zhang

Jia

et al. 2019

Laser & Photonics Reviews

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By designing a plasmonic waveguide–slit structure (a nanoslit etched in a silver nanowire) on a silver substrate, an ultrahigh Purcell factor and ultralarge figure of merit (FOM) are numerically predicted. Because of the large field enhancement (>150 times the incident field) and the ultrasmall optical volume (V ≈ 2 × 10−5λ3) of the resonant mode in the metallic nanoslit, the simulations show that the Purcell factor in the system can reach up to FP = 1.68 × 105, which is more than ten times the maximum Purcell factor in previous work (by placing metallic nanoparticles on a metal surface with a nanogap). Because of the utilization of a silver substrate rather than the common dielectric substrate, the mode cutoff of the surface plasmon polariton (SPP) waveguide mode is completely eliminated, which provides a large selection range of the nanowire radii to support the resonant mode in the nanoslit. Moreover, the SPP propagation length is significantly increased by more than 30 times. As a result, an ultralarge FOM of 1.40 × 107 is obtained, which is more than 80 times the maximum FOM in previous work where the metallic nanowire is placed on or surrounded by dielectric materials.

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Tunable room-temperature single-photon emission at telecom wavelengths from sp3 defects in carbon nanotubes

Cited by 250 publications

References 45 publications

Nonradiative Excited‐State Decay via Conical Intersection in Graphene Nanostructures

Nonradiative Excited‐State Decay via Conical Intersection in Graphene Nanostructures

Building Blocks for Quantum Network Based on Group‐IV Split‐Vacancy Centers in Diamond

Brightening and Guiding Single‐Photon Emission by Plasmonic Waveguide–Slit Structures on a Metallic Substrate

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