Controlled placement of colloidal quantum dots in sub-15 nm clusters

Manfrinato, Vitor R.; Wanger, Darcy D.; Strasfeld, David B.; Han, Hee Sun; Marsili, Francesco; Arrieta, Jose Pablo; Mentzel, Tamar; Bawendi, Moungi G.; Berggren, Karl K.

doi:10.1088/0957-4484/24/12/125302

Cited by 20 publications

(15 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Potential approaches may be lithographic patterning 33 or electro-static pad positioning. 34 Further, the highly directional emission pattern should lend itself to optical fiber coupling.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hybrid Plasmonic Bullseye Antennas for Efficient Photon Collection

et al. 2018

View full text Add to dashboard Cite

We propose highly efficient hybrid plasmonic bullseye antennas for collecting photon emission from nm-sized quantum emitters. In our approach, the emitter radiation is coupled to surface plasmon polaritons that are consequently converted into highly directional out-of-plane emission. The proposed configuration consists of a high-index titania bullseye grating separated from a planar silver film by a thin low-index silica spacer layer. Such hybrid systems are theoretically capable of directing 85% of the dipole emission into a 0.9 NA objective, while featuring a spectrally narrow-band tunable decay rate enhancement of close to 20 at the design wavelength. Hybrid antenna structures were fabricated by standard electron-beam lithography without the use of lossy adhesion layers that might be detrimental to antenna performance. The fabricated antennas remained undamaged at saturation laser powers exhibiting stable operation.For experimental characterization of the antenna properties, a fluorescent nanodiamond containing multiple nitrogen vacancy centers (NV-center) was deterministically 1 arXiv:1804.04433v1 [physics.optics] 12 Apr 2018 placed in the bullseye center, using an atomic force microscope. Probing the NV-center fluorescence we demonstrate resonantly enhanced, highly directional emission at the design wavelength of 670 nm, whose characteristics are in excellent agreement with our numerical simulations.Efficient collection of photons from single quantum emitters (QE) is a key requirement for many quantum technological applications, 1 utilizing on-demand photon generation, optical spin read-out 2,3 or coalescence of indistinguishable photons. 4,5 The efficiency by which photons can be collected is, however, often compromised by the non-unity quantum yield and relatively omnidirectional emission pattern of typical QEs, whether it is a molecule, quantum dot or solid state defect. 6 Fortunately, both aspects can be improved upon by engineering the photonic enviroment. Quantum yield may be increased by accelerating the radiative spontaneous decay rate, relative to intrinsic nonradiative decay, via the Purcell effect. 7 Directional emission is typically achieved by two approaches; 8 either a geometricalor a mode-coupling approach. The geometrical approach relies on redirecting far-field emission by reflection or refraction on appropriately shaped surfaces, such as a parabolic mirror 9 or solid immersion lens. 10 Alternatively, the mode-coupling approach is based on near-field coupling QE emission to an antenna or waveguide mode. The emission pattern then conforms to that of the antenna, 11 while for detection with an objective, plane film waveguide modes may be redirected to free space by leakage into high index substrates 12 or scattering on periodic gratings. 13,14 For highly directional emission, the circular symmetric bullseye grating is particularly attractive as tight beaming of photons is achievable by appropriate

show abstract

“…Potential approaches may be lithographic patterning 33 or electro-static pad positioning. 34 Further, the highly directional emission pattern should lend itself to optical fiber coupling.…”

Section: Resultsmentioning

confidence: 99%

“…33,34 However, for scalable single photon source fabrication, large-scale QE positioning techniques need to be explored. Potential approaches may be lithographic patterning 35 or electro-static pad positioning. 36 Further, the highly directional emission pattern should lend itself to optical fiber coupling.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Hybrid Plasmonic Bullseye Antennas for Efficient Photon Collection

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Between the QD and the gate is a thin (~5 nm) insulating layer, which can be precisely controlled by modern fabrication technology such as atomic layer deposition. The precise placement of the QD can be realized, for example, by a lift-off process demonstrated in Ref [43]. Similar to the situation in Ref [44], the single-photon induced potential change ∆V is translated into a current change ∆I by a FET through a transconductance g m (Fig.…”

Section: An Example Of Readout Schemementioning

confidence: 91%

Non-avalanche single photon detection without carrier transit-time delay through quantum capacitive coupling

Yang¹,

Wu²,

Wang³

et al. 2017

Opt. Express

View full text Add to dashboard Cite

Searching for innovative approaches to detect single photons remains at the center of science and technology for decades. This paper proposes a zero transit-time, non-avalanche quantum capacitive photodetector to register single photons. In this detector, the absorption of a single photon changes the wave function of a single electron trapped in a quantum dot (QD), leading to a charge density redistribution nearby. This redistribution translates into a voltage signal through capacitive coupling between the QD and the measurement probe. Using InAs QD/AlAs barrier as a model system, the simulation shows that the output signal reaches ~4 mV per absorbed photon, promising for high-sensitivity, ps single-photon detection.

show abstract

“…In comparison, the scheme proposed here is based on the exciton states and is suitable for scaling up due to its simpler implementation. A possible candidate of the QDs considered in this work is the chemically synthesized CdSe QDs [24] coupled to a plasmonic waveguide with the nanopatterning technology [25][26][27]. At low temperature, the radiative recombination (via phonon emission or absorption) from the exciton ground state |e in these QDs is much slower than the direct optical recombination to the zero exciton state |g (via the mixing with the lowest-energy optically active exciton state), thus resulting in a long-lived upper state |e (radiative lifetime of ∼ 2 µs at 2.3 K) and lower state |g [28].…”

Section: Introductionmentioning

confidence: 99%

Manipulation of Multipartite Entanglement in an Array of Quantum Dots

Chen,

Chuu

2021

Preprint

View full text Add to dashboard Cite

Multipartite entanglement is indispensable in the implementation of quantum technologies and the fundamental test of quantum mechanics. Here we study how the W state and W-like state may be generated in a quantum-dot array by controlling the coupling between an incident photon and the quantum dots on a waveguide. We also discuss how the coupling may be controlled to observe the sudden death of entanglement. Our work can find potential applications in quantum information processing.

show abstract

Controlled placement of colloidal quantum dots in sub-15 nm clusters

Cited by 20 publications

References 37 publications

Hybrid Plasmonic Bullseye Antennas for Efficient Photon Collection

Hybrid Plasmonic Bullseye Antennas for Efficient Photon Collection

Non-avalanche single photon detection without carrier transit-time delay through quantum capacitive coupling

Manipulation of Multipartite Entanglement in an Array of Quantum Dots

Contact Info

Product

Resources

About