Exploring Light-Matter Interaction Phenomena under Ultrastrong Coupling Regime
Exploring Light-Matter Interaction Phenomena under Ultrastrong Coupling Regime
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DOI：
10.1021/ph500266d
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发表时间：
2014-10-01
期刊：
影响因子：
7
通讯作者：
Gigli, Giuseppe
中科院分区：
文献类型：
--
作者：
Gambino, Salvatore;Mazzeo, Marco;Gigli, Giuseppe
激子-极化子是由微腔中的光子和半导体材料中的激子的简正模分裂而产生的玻色子准粒子。这种轻物质相互作用最耐人寻味的扩展之一是所谓的超强耦合机制。当拉比频率(Omega(R)，发射器和共振光子模式之间的能量交换率)达到发射器跃迁频率的相当大部分omega(0)时，就实现了这一点。在这里，我们报道了1.12 eV的Rabi能量分裂(2hOmega(R))，并记录了有机半导体微腔中材料带隙高达0.6倍的耦合比(2Omega(R)/omega(0))和室温下工作的单片异质结构有机电致发光二极管的高达0.5倍的带隙。此外，我们还表明，在如此大的耦合强度下，有可能使激子均匀的线宽不受其不均匀展宽的影响，这使得此类有机LED具有前所未有的窄发射线(低于腔精细)。后者可用于实现新型单色光源和近红外有机发光器件
Exciton-polaritons are bosonic quasiparticles that arise from the normal mode splitting of photons in a microcavity and excitons in a semiconductor material. One of the most intriguing extensions of such a lightmatter interaction is the so-called ultrastrong coupling regime. It is achieved when the Rabi frequency (Omega(R), the energy exchange rate between the emitter and the resonant photonic mode) reaches a considerable fraction of the emitter transition frequency, omega(0). Here, we report a Rabi energy splitting (2h Omega(R)) of 1.12 eV and record values of the coupling ratio (2 Omega(R)/omega(0)) up to 0.6-fold the material band gap in organic semiconductor microcavities and up to 0.5-fold in monolithic heterostructure organic light-emitting diodes working at room temperature. Furthermore, we show that with such a large coupling strength it is possible to undress the exciton homogeneous linewidth from its inhomogeneous broadening, which allows for an unprecedented narrow emission line (below the cavity finesse) for such organic LEDs. The latter can be exploited for the realization of novel monochromatic sources and near-IR organic emitting devices