Efficient anisotropic polariton lasing using molecular conformation and orientation in organic microcavities

• URL: http://arxiv.org/abs/2202.10417v1
• Date: Mon, 21 Feb 2022 18:29:25 GMT
• Title: Efficient anisotropic polariton lasing using molecular conformation and orientation in organic microcavities
• Authors: F. Le Roux, A. Mischok, D. D. C. Bradley, M. C. Gather
• Abstract summary: We report a two-fold reduction in the threshold of a polariton laser based on a high-Q microcavity filled with an active layer of poly(9,9-dioctylfluorene) (PFO) To our knowledge, this threshold is lower than demonstrated with state-of-the art optically pumped organic vertical cavity surface-emitting photon and polariton lasers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Organic exciton-photon polariton lasers have recently been shown to be remarkable candidates for the realization of efficient sources of coherent light operating at room temperature. While their thresholds are now comparable with conventional organic photon lasers, tuning of molecular conformation and orientation as a means to further enhance their performance remains largely unexplored. Here, we first report a two-fold reduction in the threshold of a polariton laser based on a high-Q microcavity filled with an active layer of poly(9,9-dioctylfluorene) (PFO) when 15% {\beta}-phase conformation is introduced. We then take advantage of the liquid crystalline properties of PFO and use a thin transparent sulfuric dye 1 (SD1) photoalignment layer to induce homogeneous nematic alignment of the polymer chains. The resulting transition dipole moment orientation increases the Rabi energy, bringing the system into the ultra-strong coupling regime where we observe anisotropic polariton lasing with an eight-fold reduction in absorbed threshold, down to 1.14 pJ / 0.36 {\mu}Jcm-2 for the direction parallel to the orientation, with no emission along the orthogonal direction. To our knowledge, this threshold is lower than demonstrated with state-of-the art optically pumped organic vertical cavity surface-emitting photon and polariton lasers. This demonstration opens new opportunities for more efficient polaritonic devices and the observation of fundamental effects at low polariton numbers.

Related papers

• Single photon emitters in monolayer semiconductors coupled to transition metal dichalcogenide nanoantennas on silica and gold substrates [49.87501877273686]
  Transition metal dichalcogenide (TMD) single photon emitters offer numerous advantages to quantum information applications. Traditional materials used for the fabrication of nanoresonators, such as silicon or gallium phosphide (GaP), often require a high refractive index substrate. Here, we use nanoantennas (NAs) fabricated from multilayer TMDs, which allow complete flexibility with the choice of substrate.
  arXiv  Detail & Related papers  (2024-08-02T07:44:29Z)
• Dark excitons and hot electrons modulate exciton-photon strong coupling in metal-organic optical microcavities [0.0]
  Polaritons are formed as a result of strong hybridization of matter with light. Their understanding is of paramount importance, but their disentanglement in optical spectroscopy, thus far remained unattainable. We show that dark excitons affect the strength of exciton-photon coupling and manifest themselves as Fano-like polaritonic gain-loss spectra.
  arXiv  Detail & Related papers  (2024-01-26T13:02:09Z)
• Directional spontaneous emission in photonic crystal slabs [49.1574468325115]
  Spontaneous emission is a fundamental out-of-equilibrium process in which an excited quantum emitter relaxes to the ground state due to quantum fluctuations. One way to modify these photon-mediated interactions is to alter the dipole radiation patterns of the emitter, e.g., by placing photonic crystals near them. Our study delves into the interaction between these directional emission patterns and the aforementioned variables, revealing the untapped potential to fine-tune collective quantum optical phenomena.
  arXiv  Detail & Related papers  (2023-12-04T15:35:41Z)
• Bipolar single-molecule electroluminescence and electrofluorochromism [50.591267188664666]
  We investigate cationic and anionic fluorescence of individual zinc phthalocyanine (ZnPc) molecules adsorbed on ultrathin NaCl films on Ag (111) by using STML. They depend on the tip-sample bias polarity and appear at threshold voltages that are correlated with the onset energies of particular molecular orbitals.
  arXiv  Detail & Related papers  (2022-10-20T09:22:45Z)
• Plasmonics enabled atomically thin linearly polarized emitter at room temperature [0.0]
  tuning of excitonic emission from monolayer WSe2 mechanically exfoliated on top of a periodic two dimensional plasmonic array of elliptical gold (Au) nanodiscs. The results demonstrate active tunability of optical emission from WSe2 by using an otherwise passive plasmonic environment and open the possibility of achieving atomically thin linearly polarized emitters at room temperature.
  arXiv  Detail & Related papers  (2022-05-25T17:38:58Z)
• Near-monochromatic tuneable cryogenic niobium electron field emitter [48.7576911714538]
  We describe electron field emission from a monocrystalline, superconducting niobium nanotip at a temperature of 5.9 K. The emitted electron energy spectrum reveals an ultra-narrow distribution down to 16 meV. This source will decrease the impact of lens aberration and enable new modes in low-energy electron microscopy, electron energy loss spectroscopy, and high-resolution vibrational spectroscopy.
  arXiv  Detail & Related papers  (2022-05-11T20:46:21Z)
• Hot-Band Absorption Can Mimic Entangled Two-Photon Absorption [52.77024349608834]
  We investigated the fluorescence signals from Rhodamine 6G and LDS798 excited with a CW laser or an entangled photon pair source at 1060 nm. We observed a signal that originates from hot-band absorption (HBA), which is one-photon absorption from thermally-populated vibrational levels of the ground electronic state. For the typical conditions under which E2PEF measurements are performed, contributions from the HBA process could lead to a several orders-of-magnitude overestimate of the quantum advantage for excitation efficiency.
  arXiv  Detail & Related papers  (2021-11-10T21:17:47Z)
• Formation of Matter-Wave Polaritons in an Optical Lattice [0.0]
  polariton is a quasiparticle formed by strong coupling of a photon to a matter excitation. We develop an ultracold-atom analogue of an exciton-polariton system in which interacting polaritonic phases can be studied. Our work opens up novel possibilities for studies of polaritonic quantum matter.
  arXiv  Detail & Related papers  (2021-09-06T04:46:31Z)
• Resonantly pumped bright-triplet exciton lasing in caesium lead bromide perovskites [0.0]
  We showcase a resonant optical pumping scheme on a fast triplet-state in CsPbBr3 nanocrystals. The scheme allows us to realize a polarized triplet-laser source that dramatically enhances the coherent signal by one order of magnitude. The emission is generated by pumping selectively on a weakly-confined excitonic state with a Bohr radius 10 nm in the nanocrystals.
  arXiv  Detail & Related papers  (2021-07-14T16:08:33Z)
• Organic single-photon switch [0.0]
  We harness a microcavity forming correlated collective dressed states of light, so-called of exciton-polariton condensates. We explore an efficient way for all-optical ultra-fast control over the macroscopic condensate wavefunction via a single photon.
  arXiv  Detail & Related papers  (2020-05-12T14:23:01Z)
• Optical projection and spatial separation of spin entangled triplet-pairs from the S1 (21Ag-) state of pi-conjugated systems [40.96261204117952]
  We experimentally demonstrate that S1 (21Ag-) is a superposition state with strong contributions from spin-entangled pairs of triplet excitons (1(TT)) We show that optical manipulation of the S1 (21Ag-) wavefunction using triplet absorption transitions allows selective projection of the 1(TT) component into a manifold of spatially separated triplet-pairs with lifetimes enhanced by up to one order of magnitude. Our results provide a unified picture of 21Ag-states in pi-conjugated materials and open new routes to exploit their dynamics in singlet fission, photobiology and for the
  arXiv  Detail & Related papers  (2020-02-27T22:09:43Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.