Nano-second exciton-polariton lasing in organic microcavities

Putintsev, Anton; Zasedatelev, Anton; McGhee, Kirsty E.; Cookson, Tamsin; Georgiou, Kyriacos; Sannikov, Denis; Lidzey, David G.; Lagoudakis, Pavlos G.

doi:10.1063/5.0019195

Cited by 20 publications

(19 citation statements)

References 37 publications

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“…In recent years, polariton BECs have been observed in microcavities containing many different species of organic molecules. [8][9][10][11][12][13][14][15][16][17][18]25,26] In organic microcavities, the Rabi splitting energy, which is the minimum splitting between upper polariton (UP) and LP bands and characterizes the light-matter interaction strength, is usually the order of 0.1-1 eV. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] This large Rabi splitting allows for the realization of polariton condensates at room temperature.…”

Section: Doi: 101002/adom202102034mentioning

confidence: 99%

“…[8][9][10][11][12][13][14][15][16][17][18]25,26] In organic microcavities, the Rabi splitting energy, which is the minimum splitting between upper polariton (UP) and LP bands and characterizes the light-matter interaction strength, is usually the order of 0.1-1 eV. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] This large Rabi splitting allows for the realization of polariton condensates at room temperature. However, the thresholds for condensation under optical excitation in dielectric and plasmonic microcavities containing organic molecules range from P th ≈ 11 to 500 µJ cm −2 , [8][9][10][11][12][13][14][15][16][17][18]25,26] which are still too high for many optoelectronic applications.…”

Section: Doi: 101002/adom202102034mentioning

confidence: 99%

“…[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] This large Rabi splitting allows for the realization of polariton condensates at room temperature. However, the thresholds for condensation under optical excitation in dielectric and plasmonic microcavities containing organic molecules range from P th ≈ 11 to 500 µJ cm −2 , [8][9][10][11][12][13][14][15][16][17][18]25,26] which are still too high for many optoelectronic applications. Therefore, achieving a significant decrease of the BEC threshold continues to be a major challenge in the field.…”

Section: Doi: 101002/adom202102034mentioning

confidence: 99%

See 2 more Smart Citations

Low‐Threshold Exciton‐Polariton Condensation via Fast Polariton Relaxation in Organic Microcavities

Ishii

Miyata

Mamada

et al. 2021

Advanced Optical Materials

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In organic microcavities, a macroscopic condensate of exciton‐polaritons can be formed at high‐exciton polariton densities. The threshold for forming this condensate is proportional to the relaxation rate from initially excited excitons to these polaritons and the lifetime of the lowest energy polariton states. Although the influence of the lower polariton (LP) lifetime on the threshold has been studied, the relationship between the polariton relaxation rate and the threshold has not been fully explored. In this study, a room‐temperature polariton condensate is demonstrated at a threshold pump fluence of 9.7 ± 0.1 µJ cm−2, in a microcavity containing 4,4″‐bis((E)‐4‐(3,6‐bis(2‐ethylhexyl)‐(9H‐carbazol‐9‐yl))styryl)‐1,1″‐biphenyl (BSBCz‐EH). By using a semiclassical model to describe the polariton kinetics, it is revealed that this low threshold results from the rapid relaxation rate from the dark exciton reservoir to the set of the LP states forming the condensate, with an effective rate Wep ≈ 2.0 × 10−5 cm3 s−1. These results show that accelerating polariton relaxation is possible and is an important factor for realizing low‐threshold polariton condensates.

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Section: Doi: 101002/adom202102034mentioning

confidence: 99%

Section: Doi: 101002/adom202102034mentioning

confidence: 99%

Section: Doi: 101002/adom202102034mentioning

confidence: 99%

See 1 more Smart Citation

Low‐Threshold Exciton‐Polariton Condensation via Fast Polariton Relaxation in Organic Microcavities

Ishii

Miyata

Mamada

et al. 2021

Advanced Optical Materials

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“…1 to fabricate a series of strongly-coupled microcavities containing the molecular dye bromine-substituted boron-dipyrromethene (BODIPY-Br). This dye combines high oscillator strength and relatively high photoluminescence quantum yield, and has previously been shown to undergo polariton-condensation 18 , 34 . Additionally, its photoluminescence (PL) emission lies in a spectral region not easily accessible with traditional inorganic semiconductors (green/yellow), making it desirable for laser applications.…”

Section: Resultsmentioning

confidence: 99%

Polariton condensation in an organic microcavity utilising a hybrid metal-DBR mirror

McGhee

Putintsev

Jayaprakash

et al. 2021

Sci Rep

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We have developed a simplified approach to fabricate high-reflectivity mirrors suitable for applications in a strongly-coupled organic-semiconductor microcavity. Such mirrors are based on a small number of quarter-wave dielectric pairs deposited on top of a thick silver film that combine high reflectivity and broad reflectivity bandwidth. Using this approach, we construct a microcavity containing the molecular dye BODIPY-Br in which the bottom cavity mirror is composed of a silver layer coated by a SiO2 and a Nb2O5 film, and show that this cavity undergoes polariton condensation at a similar threshold to that of a control cavity whose bottom mirror consists of ten quarter-wave dielectric pairs. We observe, however, that the roughness of the hybrid mirror—caused by limited adhesion between the silver and the dielectric pair—apparently prevents complete collapse of the population to the ground polariton state above the condensation threshold.

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“…[ 163 ] They found that at a low temperature (<45 K), inefficient phonon–polariton interactions led to change in polariton population and eventually increase in the polariton lasing threshold. Putintsev et al [ 164 ] demonstrate quasi‐steady‐state polariton lasing (nanosecond scale) in a BODIPY‐Br dye λ /2 planar microcavity. Under 4 ns‐long nonresonant excitation, 1.2 ns polariton lasing was achieved, being four orders of magnitude longer than the inherent polariton lifetime.…”

Section: Typical Resonator Architecturesmentioning

confidence: 99%

Toward Electrically Pumped Organic Lasers: A Review and Outlook on Material Developments and Resonator Architectures

Zhang

Wen²,

Huang³

et al. 2021

Advanced Photonics Research

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Organic lasers have undergone decades of development. A myriad of materials with excellent optical gain properties, including small molecules, dendrimers, and polymers, have been demonstrated. Various resonator geometries have also been applied. While sharing the advantages of the solution processability and mechanical flexibility features of organic materials, organic optical gain media also offer interesting optical properties, such as emission tunability through chemical functionalization and inherent large optical gain coefficients. They offer prospects for different applications in the fields of bioimaging, medicine, chemo‐ and biosensing, anticounterfeit applications, or displays. However, the realization of electrically pumped organic lasers still remains a challenge due to the inherent drawbacks of organic semiconductors, e.g., modest carrier mobility, long‐lived excited‐state absorption, and extra losses which originate in the device (e.g., absorption from metal electrodes). Herein, the past developments of organic lasers are discussed, highlighting the importance of materials and cavities with regard to the goal of electrically pumped organic lasers. The latest progress and the possible ways to address the challenge are discussed.

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Nano-second exciton-polariton lasing in organic microcavities

Cited by 20 publications

References 37 publications

Low‐Threshold Exciton‐Polariton Condensation via Fast Polariton Relaxation in Organic Microcavities

Low‐Threshold Exciton‐Polariton Condensation via Fast Polariton Relaxation in Organic Microcavities

Polariton condensation in an organic microcavity utilising a hybrid metal-DBR mirror

Toward Electrically Pumped Organic Lasers: A Review and Outlook on Material Developments and Resonator Architectures

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