Wide-Angle Interferences and the Nature of the Elementary Light Sources

Selényi, P.

doi:10.1103/physrev.56.477

Cited by 30 publications

(11 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…F OR a long time, spontaneous emission rates were believed to be an intrinsic property of a material, and that such light could be manipulated only after the photons were emitted. It was later understood that spontaneous emission also depends strongly on the surrounding environment through the density of states and the local strength of the electromagnetic modes [1]. We expect this to have valuable implications for the design of light-emitting diodes (LED's).…”

Section: Introductionmentioning

confidence: 99%

“…Such a gap is a range of frequencies in which no electromagnetic modes can exist. The following spontaneous emission rate can be given by Fermi's Golden Rule: (1) where is the electric dipole of the transition, is the local zero-point rms electric field, and is the density of electromagnetic modes. In a photonic bandgap, the electromagnetic density of states is zero, inhibiting spontaneous emission [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spontaneous emission extraction and Purcell enhancement from thin-film 2-D photonic crystals

Boroditsky

Vrijen

Krauss

et al. 1999

J. Lightwave Technol.

277

225

View full text Add to dashboard Cite

Electromagnetic band structure can produce either an enhancement or a suppression of spontaneous emission from two-dimensional (2-D) photonic crystal thin films. We believe that such effects might be important for light emitting diodes. Our experiments were based on thin-film InGaAs/InP 2-D photonic crystals at ambient temperature, but the concepts would apply equally to InGaN thin films, for example. We show that the magnitude of Purcell enhancement factor, F F F p p p 2, for spatially extended band modes, is similar to that for a tiny mode in a three-dimensional (3-D) nanocavity. Nonetheless, light extraction enhancement that arises from Zone folding or Bragg scattering of the photonic bands is probably the more important effect, and an external quantum efficiency >50% is possible. Angle resolved photoluminescence from inside the photonic crystal gives a direct spectral readout of the internal 2-D photonic band dispersion. The tradeoffs for employing various photonic crystal structures in high efficiency light-emitting diodes are analyzed.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spontaneous emission extraction and Purcell enhancement from thin-film 2-D photonic crystals

Boroditsky

Vrijen

Krauss

et al. 1999

J. Lightwave Technol.

277

225

View full text Add to dashboard Cite

show abstract

“…Likewise P em,y stands for the emission probability in the y direction and is then a sinus squared between the y direction and the transition emission dipole of the molecule. Hence we must introduce the angle β between the absorption and emission transition dipoles of the molecule, which is known to be a constant, depending only on the molecular structure of the dye [57].…”

Section: Influence Of the Pump Polarizationmentioning

confidence: 99%

Gain properties of dye-doped polymer thin films

et al. 2015

View full text Add to dashboard Cite

Hybrid pumping appears as a promising compromise in order to reach the much coveted goal of an electrically pumped organic laser. In such configuration the organic material is optically pumped by an electrically pumped inorganic device on chip. This engineering solution requires therefore an optimization of the organic gain medium under optical pumping. Here, we report a detailed study of the gain features of dye-doped polymer thin films. In particular we introduce the gain efficiency K, in order to facilitate comparison between different materials and experimental conditions. The gain efficiency was measured with various setups (pump-probe amplification, variable stripe length method, laser thresholds) in order to study several factors which modify the actual gain of a layer, namely the confinement factor, the pump polarization, the molecular anisotropy, and the re-absorption. For instance, for a 600 nm thick 5 wt% DCM doped PMMA layer, the different experimental approaches give a consistent value K ≃ 80 cm.MW −1 . On the contrary, the usual model predicting the gain from the characteristics of the material leads to an overestimation by two orders of magnitude, which raises a serious problem in the design of actual devices. In this context, we demonstrate the feasibility to infer the gain efficiency from the laser threshold of well-calibrated devices. Besides, temporal measurements at the picosecond scale were carried out to support the analysis.

show abstract

“…In contrast to a common, intuitive belief that the spontaneous emission rate is an intrinsic property of a material, and that the photons could be manipulated only after the emission, it was shown both theoretically and experimentally that the rate of the spontaneous emission and the stimulated emission can be controlled by varying the background photon state density [2,19,20]. Along this line, we consider an atom with two electron energy levels p and q.…”

Section: Lasing With Two-level Atomsmentioning

confidence: 99%

Photonic band gap and x-ray optics in warm dense matter

Son²,

Moon

2010

Physics of Plasmas

View full text Add to dashboard Cite

Photonic band gaps for the soft x-rays, formed in the periodic structures of solids or dense plasmas, are theoretically investigated. Optical manipulation mechanisms for the soft x-rays, which are based on these band gaps, are computationally demonstrated. The reflection and amplification of the soft x-rays, and the compression and stretching of chirped soft x-ray pulses are discussed.A scheme for lasing with atoms with two energy levels, utilizing the band gap, is also studied.

show abstract

Wide-Angle Interferences and the Nature of the Elementary Light Sources

Cited by 30 publications

References 8 publications

Spontaneous emission extraction and Purcell enhancement from thin-film 2-D photonic crystals

Spontaneous emission extraction and Purcell enhancement from thin-film 2-D photonic crystals

Gain properties of dye-doped polymer thin films

Photonic band gap and x-ray optics in warm dense matter

Contact Info

Product

Resources

About