Polariton Induced Transparency at Low Light Level: Polymer Chains Dispersed in a Monomer Single Crystal

Weiser, G.; Berréhar, J.

doi:10.1103/physrevlett.99.196401

Cited by 9 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(26) gives a thermal coherence length, (N coh − 1)d ≈ 350 Å, in excellent agreement with the coherence length (in blue-phase PDA) measured using the Franz-Keldysh effect in Ref. The coupling between the very large oscillator strength of the PDA chain and the light field may produce polaritons 34,35 at sufficiently large excitation light intensities. The value is, however, significantly less than the coherence length of several microns measured in microfluorescence experiments on red-phase PDA.…”

Section: Applications To Pdasupporting

confidence: 81%

Vibronic coupling in quantum wires: Applications to polydiacetylene

Yamagata

Spano

2011

The Journal of Chemical Physics

115

View full text Add to dashboard Cite

A theory describing vibronic coupling in direct band gap, one-dimensional semiconductors is developed to account for the photophysical properties of isolated, defect-free conjugated polymers. A Holstein-like Hamiltonian represented in a multi-particle basis set is used to evaluate absorption and emission due to Wannier-Mott excitons. The photophysical properties of such quantum wires are shown to strongly resemble those of Frenkel exciton J-aggregates. The 1(1)B(u) exciton coherence length and effective mass are readily determined from the ratio of the 0-0 and 0-1 line strengths, I(0 - 0)/I(0 - 1), in the photoluminescence spectrum. I(0 - 0)/I(0 - 1) is shown to follow a T(-1/2) dependence, in an excellent agreement with experiments on the red-phase of polydiacteylene.

show abstract

Section: Applications To Pdasupporting

confidence: 81%

Vibronic coupling in quantum wires: Applications to polydiacetylene

Yamagata

Spano

2011

The Journal of Chemical Physics

115

View full text Add to dashboard Cite

show abstract

“…This is in stark contrast to works which have shown EP formation under strict resonant excitation 27,77 (optical field ~0.02 V m -1 ) in macroscopic single crystals with optical densities ~10 times larger than those used here 27,77 , and at cryogenic temperatures. We remark that our transport velocities compare to those on standard microcavity polaritons 11 where velocities of ~1 × 10 6 m s -1 were reported.…”

contrasting

confidence: 99%

“…Intrinsic polaritons show anomalous dispersion and can be identified through coherent oscillations patterns in the retardation of propagating ultrafast pulses [19][20][21][22][23] . In organic materials this formalism effectively rationalises the metallic reflectivity of some macroscopic organic single crystals and has been investigated in detail elsewhere [24][25][26][27][28] . However, to the best of our knowledge, such 'intrinsic' polaritons have neither a well-defined photonic state nor distinct EP lifetime in organic systems, and it is unclear to what extent they carry electronic population; in inorganic systems they may support a lifetime 29 .…”

mentioning

confidence: 99%

Microcavity-Like Exciton-Polaritons can be the Primary Photoexcitation in Bare Organic Semiconductors

Rao

Pandya

Chen

et al. 2021

Preprint

View full text Add to dashboard Cite

Exciton-polaritons (EPs) are quasiparticles formed by the hybridization of excitons with light modes. As organic semiconductors sustain stable excitons at room-temperature, these materials are being actively studied for room temperature polaritonic devices1–3. This is typically in the form of cavity-based systems, where molecules are confined between metallic or dielectric mirrors 4–6 or in a plasmonic gap 7,8. In such systems strong light-matter coupling gives rise to polariton splittings on the order of 200 to 300 meV 6. A wide range of phenomena have been demonstrated in cavity-polariton systems including super-fluidity9, precisely controlled chemical reactions10 and long-range energy propagation11. Here, using a range of chemically diverse model organic systems we show that interactions between excitons and moderately confined photonic states within the (thin) film can lead to the formation of EPs, with a defined lifetime, even in the absence of external cavities. We demonstrate the presence of EPs via angular dependent splittings in reflectivity spectra on the order of 30 meV and collective emission from ~5 ×107 coupled molecules. Additionally, we show that at room temperature these EPs can transport energy up to ~270 nm at velocities of ~5 ×106 m s-1. This propagation velocity and distance is sensitive to, and can be tuned by, the refractive index of the external environment. However, although sensitive to the nanoscale morphology the formation of the exciton-polariton states is a general phenomenon, independent of underlying materials chemistry, with the principal material requirements being a high oscillator strength per unit volume and low disorder. These results and design rules will enable the harnessing of EP effects for a new application in optoelectronics, light harvesting 9,12,13 and cavity controlled chemistry without the limiting requirement of an external cavity.

show abstract

“…The saturation cannot result from undamped propagation of a tightly bound polariton state of exciton and photon as in 3BCMU since it is independent of temperature. 16 Light of polarization ! e k a provides best coupling to the transition dipoles of the chain but excites on the ac face two propagating electromagnetic waves of orthogonal polarization since only the b-axis de…nes a principal axis of the dielectric tensor.…”

Section: Optical Birefringencementioning

confidence: 99%

“…14,15 By increasing the density of blue chains coherent coupling of excitons to radiation modes of the monomer crystal leads to a tightly bound polariton which enables transmission of light in resonance to the exciton through thick crystals of 3BCMU. 16,17 Despite such unique properties the very same C 4 building block leaves little room for variation of these quantum wires. A promising modi…cation is doubling the repeat unit as in poly-THD (1,6-bis(diphenylamino)-2,4-hexadiyne)…”

Section: Introductionmentioning

confidence: 99%

Stark effect and Franz-Keldysh effect of a quantum wire realized by conjugated polymer chains of a diacetylene 3NPh2

et al. 2010

Self Cite

View full text Add to dashboard Cite

Conjugated polymer chains diluted in monomer single crystals of a novel diacetylene, 1,10-bis(diphenylamino)-4,6-decadiyne, represent quantum wires of long range coherence. They di¤er from most polydiacetylenes by their repeat unit that consists of two C 4 units with twisted molecular planes. The resulting modi…cation of exciton and band states is studied by electroabsorption which resolves an increase of the exciton transition energy to 2.399 eV and of the free electron gap to 3.158 eV. The Stark shift of the exciton reveals a signi…cant reduction of the exciton radius by about 40 % to 6 1 Å which is consistent with a similar increase of the exciton binding energy to 759 meV. The lineshape of electroabsorption spectra at the free electron gap is for …elds larger than 30 kV/cm in accordance with the one-dimensional Franz-Keldysh e¤ect and yields a reduced mass of 0.07 m 0 larger than in other PDA. Spectra at smaller …elds are distorted by contributions of a weak dipole allowed and a forbidden exciton 38 and 12 meV, respectively below the bandgap.Coherent coupling of free electrons and vibrational modes leads to replicas of the Franz-Keldysh e¤ect. Since light polarized parallel to the conjugated chain excites two propagating modes in the monomer crystals the quantitative analysis was restricted to EA spectra taken with perpendicular polarization in samples which transmit only the weakly absorbed polariton mode.

show abstract

Polariton Induced Transparency at Low Light Level: Polymer Chains Dispersed in a Monomer Single Crystal

Cited by 9 publications

References 15 publications

Vibronic coupling in quantum wires: Applications to polydiacetylene

Vibronic coupling in quantum wires: Applications to polydiacetylene

Microcavity-Like Exciton-Polaritons can be the Primary Photoexcitation in Bare Organic Semiconductors

Stark effect and Franz-Keldysh effect of a quantum wire realized by conjugated polymer chains of a diacetylene 3NPh2

Contact Info

Product

Resources

About