In the field of condensed matter, graphene plays a central role as an emerging material for nanoelectronics. Nevertheless, is semimetal, which constitutes severe limitation some future applications. Therefore, lot efforts are being made to develop semiconductor materials whose structure compatible with lattice. this perspective, little pieces represent promising alternative. particular, their electronic, optical and spin properties can be in principle controlled by designing size, shape...

The narrow emission of a single carbon nanotube at low temperature is coupled to the optical mode fiber microcavity using built-in spatial and spectral matching brought by this flexible geometry. A thorough cw time-resolved investigation very same emitter both in free space cavity shows an efficient funneling into together with strong enhancement corresponding Purcell factor up 5. At time, emitted photons retain sub-Poissonian statistics. By exploiting feeding effect on phonon wings, we...

We report on the ultraviolet optical response of a color center in hexagonal boron nitride. demonstrate mapping between vibronic spectrum and phonon dispersion nitride, with striking suppression assisted emission signal at energy gap. By means nonperturbative calculations electron-phonon interaction strongly anisotropic dispersion, we reach quantitative interpretation acoustic sidebands from cryogenic temperatures up to room temperature. Our analysis provides an original method for...

We have realized an electroluminescent device operating in the light-matter strong-coupling regime based on a $\mathrm{GaAs}/\mathrm{AlGaAs}$ quantum cascade structure embedded planar microcavity. At zero bias, reflectivity measurements show polariton anticrossing between intersubband transition and cavity mode. Under electrical injection spectral features of emitted light change drastically, as electrons are resonantly injected reduced part branches. Our experiments demonstrate that can be...

We employ heterodyne interferometry to investigate the effect of a single organic molecule on phase propagating laser beam. report first phase-contrast images individual molecules and demonstrate single-molecule electro-optical switch by applying voltage microelectrodes embedded in sample. Our results may find applications holography, fast optical coherent signal processing, single-emitter quantum operations.

We analyze the temperature performance of five terahertz (THz)-frequency quantum cascade lasers based on a three-quantum-well resonant-phonon depopulation design as function operating frequency in 2.3-3.8-THz range. find evidence that device is limited by interplay between two factors: 1) optical phonon scattering thermal electrons, which dominates at shorter wavelengths, and 2) parasitic current, longer wavelengths. present simple model provides an accurate estimate current these devices...

We report on the photoluminescence of pairs organic color centers in single-wall carbon nanotubes grafted with 3,5-dichlorobenzene. Using various techniques such as intensity correlations, superlocalization microscopy, and luminescence excitation spectroscopy, we distinguish two same nanotube; distance between is order several hundreds nanometers. In contrast, by studying strong temporal correlations spectral diffusion framework photoinduced Stark effect, can estimate within each pair to be...

A scheme for strong coupling between a single atomic spin and the rotational mode of levitating nanoparticles is proposed. The idea based on read-out NV centers embedded in aspherical nanodiamonds an ion trap. We show that asymmetry diamond induces confinement Using weak homogeneous magnetic field microwave driving we then demonstrate center can be strongly coupled to motion diamond.

At low temperature the photoluminescence of single-wall carbon nanotubes show a large variety spectral profiles ranging from ultranarrow lines in suspended to broad and asymmetrical line shapes that puzzle current interpretation terms exciton-phonon coupling. Here, we present complete set matrix embedded including unprecedented narrow emission lines. We demonstrate diversity low-temperature luminescence originates tiny modifications their low-energy acoustic phonon modes. When modes are...

The use of integrated photonic structures to tailor the behavior light is extremely promising for optimizing performance and introducing advanced functionalities into optoelectronic devices. We demonstrate a powerful method based on photonic-band engineering which allows optimization resonator quality factors devices operating band-edge photonic-crystal states. also show that carefully designed π-shifts in two-dimensional photonic-resonators give enhanced beam properties. application these...

We report on the coupling of a reconfigurable high Q fiber micro-cavity to an organic color center grafted carbon nanotube for telecom wavelength emission single photons in Purcell regime. Using three complementary approaches, we assess various figures merit this tunable photon source and cavity quantum electrodynamical effects: brightening emitter is obtained by comparison count rates very same free-space coupled regimes. demonstrate single-photon output rate up 20 MHz at 1275 nm....

We propose the use of a quantum cascade approach to achieve photon emission from intersubband cavity polariton states. Judicious engineering electronic band structure and microcavity resonator allows one obtain in strong light–matter coupling regime under electrical excitation. In particular, we show that, using InP-based multiple well structures, large splittings about 40 meV can be obtained within mid-infrared range electromagnetic spectrum (intersubband transition energy ≈130 meV,...

The authors demonstrate terahertz microcavity lasers with ultralow current thresholds (Ith≈4mA) and reduced mode volumes of ≈0.7(λeffective)3, i.e., less than one cubic wavelength. A double metal waveguide active core thickness (5.82μm) is used to achieve confinement in the vertical direction, without compromising laser performances. Confinement longitudinal direction obtained using microdisk resonators. guiding properties surface plasmons are exploited guide contact. This makes use a...

We demonstrate a framework to understand and predict the far-field emission in terahertz frequency photonic-crystal quantum cascade lasers. The devices, which employ high-performance three-well active region, are lithographically tunable emit 104-120 microm wavelength range. A peak output power of 7 mW pulsed mode is obtained at 10 K, typical device maximum operating temperature 136 K. identify band-edge states involved lasing process as originating from hexapole monopole modes G point...

Condensed-matter emitters offer enriched cavity quantum electrodynamical effects due to the coupling external degrees of freedom. In case carbon nanotubes a very peculiar between localized excitons and one-dimensional acoustic phonon modes can be achieved, which gives rise pronounced wings in luminescence spectrum. By an individual nanotube tunable optical micro-cavity, we show that this exciton-phonon is valuable resource enlarge tuning range single-photon source while keeping excellent...

Surface plasmons are electromagnetic waves originating from electrons and light oscillations at metallic surfaces. Since freely propagating cannot be coupled directly into surface-plasmon modes, a compact, semiconductor electrical device capable of generating SPs on the top surface would represent an advantage: not only SP manipulation become easier, but Au-metalized surfaces can easily functionalized for applications. Here, we report demonstration such device. The direct proof generation is...

A thermodynamics study shows that the non-covalent interaction between carbon nanotubes and hydrophobic porphyrin monomers is stronger for with larger diameter.

Surface emitting photonic-crystal quantum cascade lasers operating at λ≈7.3 μm are demonstrated. The photonic crystal resonator is written solely on the top metallization layer. mismatch between modes supported by metallized and nonmetallized regions yields enough optical feedback to achieve laser action. devices exhibit single-mode emission with a side mode suppression ratio of ≈20 dB, wavelength lithographically tunable across range almost 70 cm−1, radiation emitted from surface. maximum...

At cryogenic temperature and at the single emitter level, optical properties of single-wall carbon nanotubes depart drastically from that a one-dimensional (1D) object. In fact, (usually unintentional) localization excitons in local potential wells leads to nearly 0D behaviors such as photon antibunching, spectral diffusion, inhomogeneous broadening, etc. Here, we present an hyperspectral imaging this exciton self-localization effect nanotube level using super-resolved microscopy approach....

It is demonstrated that the active region thickness of THz quantum cascade lasers can be reduced by a factor 2 without effects on threshold current density and maximum operating temperature laser. Pulsed continuous-wave operation, with low Jth= 71 A/cm2, are obtained for 5.86 µm-thick QC The emission peaked at λ≃115 µm waveguide resonator based metal-metal geometry.

We report single-mode, surface-emitting, mid-IR, photonic-crystal (PhC), quantum-cascade lasers with linearly polarized and highly directional single-lobed emission. A metallic square-lattice photonic crystal elliptical air holes pi phase shift was used as the resonator. The 2D feedback coupling--necessary for operation of resonator--is induced by mismatch between modes supported metalized nonmetalized regions yields single-mode output a side-mode suppression ratio >30 dB. modify relative...

Carbon nanotubes are quantum sources whose emission can be tuned at telecommunication wavelengths by choosing the diameter appropriately. Most applications require smallest possible linewidth. Therefore, study of underlying dephasing mechanisms is utmost interest. Here, we report on low-temperature photoluminescence high crystalline quality individual single-wall carbon synthesized laser ablation (L-SWNTs) and emitting wavelengths. A thorough statistical analysis their spectra reveals a...

Graphene quantum dots, atomically precise nanopieces of graphene, are promising nanoobjects with potential applications in various domains such as photovoltaics, light emitters and bio-imaging.