Photon antibunching in single-walled carbon nanotubes at telecommunication wavelengths and room temperature

Endo, Takumi; Ishi‐Hayase, Junko; Maki, Hideyuki

doi:10.1063/1.4915618

Cited by 43 publications

(36 citation statements)

References 32 publications

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“…As NIR photoluminescent materials, SWNTs are expected to be of practical use in the imaging of biological tissues, telecommunications, and other applications. [4][5][6][7][8] Recently, it has been reported that the chemical functionalization of SWNTs, such as photooxidation, arylation, and alkylation, induces bright and red-shied NIR PL peaks. [9][10][11][12][13][14][15][16][17][18][19] Based on density functional theory (DFT) calculations, it was proposed that the new PL peak is derived from splitting of the frontier orbitals of SWNTs by sidewall functionalization.…”

Section: Introductionmentioning

confidence: 99%

Influence of local strain caused by cycloaddition on the band gap control of functionalized single-walled carbon nanotubes

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Influence of local strain caused by cycloaddition on the band gap control of functionalized single-walled carbon nanotubes

et al. 2019

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“…In particular, the absorption and photoluminescence (PL) of the SWNTs arise in the near infra-red (NIR) region by the Van Hove singularity 2 . Based on the advantage of the NIR PL in the high transparency for biological tissues and in the telecommunication wavelengths, applications for imaging, sensing and optical devices have been widely studied 3 4 5 6 7 8 . A fundamental drawback of the SWNT materials, however, is the low quantum yield (φ < 1%) 9 due to i) optically-forbidden transition states for dark exciton that exist at the lower energy levels than the optically-allowed transition states for the bright exciton 10 , and ii) exciton quenching through collision with defect sites 11 or with other excitons 12 that can frequently occur owing to the 1D-confined structure.…”

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confidence: 99%

Emergence of new red-shifted carbon nanotube photoluminescence based on proximal doped-site design

Shiraki

Shiraishi

Juhász

et al. 2016

Sci Rep

129

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Single-walled carbon nanotubes (SWNTs) show unique photoluminescence (PL) in the near-infrared (NIR) region. Here we propose a concept based on the proximal modification in local covalent functionalization of SWNTs. Quantum mechanical simulations reveal that the SWNT band gap changes specifically based on the proximal doped-site design. Thus, we synthesize newly-designed bisdiazonium molecules and conduct local fucntionalisation of SWNTs. Consequently, new red-shifted PL (E112*) from the bisdiazonium-modified SWNTs with (6, 5) chirality is recognized around 1250 nm with over ~270 nm Stokes shift from the PL of the pristine SWNTs and the PL wavelengths are shifted depending on the methylene spacer lengths of the modifiers. The present study revealed that SWNT PL modulation is enable by close-proximity-local covalent modification, which is highly important for fundamental understanding of intrinsic SWNT PL properties as well as exciton engineering–based applications including photonic devices and (bio)imaging/sensing.

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Widely Tunable Single-Photon Source from a Carbon Nanotube in the Purcell Regime

et al. 2016

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Single-Wall Carbon Nanotubes (SWNTs) are among the very few candidates for single-photon sources operating in the telecom bands since they exhibit large photon antibunching up to room temperature [1][2][3][4][5]. However, coupling a nanotube to a photonic structure is highly challenging because of the random location and emission wavelength in the growth process [6][7][8][9]. Here, we demonstrate the realization of a widely tunable single-photon source by using a carbon nanotube inserted in an original repositionable fiber micro-cavity: we fully characterize the emitter in the free-space and subsequently form the cavity around the nanotube. This brings an invaluable insight into the emergence of quantum electrodynamical effects. We observe an efficient funneling of the emission into the cavity mode with a strong sub-Poissonian statistics together with an up to 6-fold Purcell enhancement factor. By exploiting the cavity feeding effect on the phonon wings, we locked the single-photon emission at the cavity frequency over a 4 THz-wide band while keeping the mode width below 80 GHz. This paves the way to multiplexing and multiple qubit coupling.Coupling a carbon nanotube to a photonic resonator in a reliable way is highly desirable both for technological developments in view of quantum cryptography or quantum computation and for academical studies since nanotubes behave like an original nano-emitter showing an hybrid 1D-0D electronic behavior [10]. In addition, the low-cost, the high integrability and the possible electrical excitation of nanotubes [11] are attractive assets in such perspectives. However, due to the lack of control of the current growth or deposition processes, current attempts rely on random spectral and spatial matching between a resonator (micro-discs [12] or photonic crystals [13]) and randomly deposited nanotubes, leading to a very limited fabrication yield. This constrain becomes especially stringent when a high coupling between the emitter and the cavity is sought, which requires narrow spectral features.In this work, we propose an original approach where the nanotube is fully characterized in free-space by regular low-temperature micro-photoluminescence (micro-PL) spectroscopy and where a micro-cavity is subsequently formed around the emitter by approaching a concave dielectric mirror micro-engineered at the apex of an optical fiber. This geometry brings an unprecedented flexibility giving a built-in spectral and spatial matching, together with excellent quality factors and mode volumes [14]. Individual carbon nanotubes embedded in a polystyrene matrix were coupled to the cavity resulting in a strong brightening of the nanotube of more than an order of magnitude, bringing evidence for the relevance of exploiting cavity quantum electrodynamical (CQED) effects to enhance the photonic properties of carbon nanotubes. By means of time-resolved measurements we were able to investigate directly the cavityenhanced emission rate and found a corresponding Purcell factor F p of up to 5. In the same tim...

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Photon antibunching in single-walled carbon nanotubes at telecommunication wavelengths and room temperature

Cited by 43 publications

References 32 publications

Influence of local strain caused by cycloaddition on the band gap control of functionalized single-walled carbon nanotubes

Influence of local strain caused by cycloaddition on the band gap control of functionalized single-walled carbon nanotubes

Emergence of new red-shifted carbon nanotube photoluminescence based on proximal doped-site design

Widely Tunable Single-Photon Source from a Carbon Nanotube in the Purcell Regime

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