Topic
Spontaneous emission
About: Spontaneous emission is a research topic. Over the lifetime, 12855 publications have been published within this topic receiving 323684 citations.
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TL;DR: In this article, the authors demonstrate room-temperature lowthreshold current lasing action from electrically driven wavelength-scale high-quality photonic crystal lasers having large spontaneous emission factors by solving the theoretical and technical constraints laid upon by the additional requirement of the current injection.
Abstract: We demonstrate room-temperature low-threshold-current lasing action from electrically driven wavelength-scale high-quality photonic crystal lasers having large spontaneous emission factors by solving the theoretical and technical constraints laid upon by the additional requirement of the current injection. The ultrasmall cavity is electrically pulse pumped through a submicron-size semiconductor "wire" at the center of the mode with minimal degradation of the quality factor. In addition, to better utilize the low mobility of the hole, we employ a doping structure that is inverted from the conventional semiconductors. Rich lasing actions and their various characteristics are experimentally measured in the single-cell and three-cell photonic crystal cavities. Several relevant measurements are compared with three-dimensional finite-difference time-domain computations based on the actual fabricated structural parameters. The electrically driven photonic crystal laser, which is a small step toward a "practical" form of the single photon source, represents a meaningful achievement in the field of photonic crystal devices and photonic integrated circuits as well as of great interest to the quantum electrodynamics and quantum information communities.
69 citations
TL;DR: The high device performances of 8 microm quantum cascade lasers with cavity lengths of 4 mm and 1.5 mm are demonstrated, and the high stability for temperature changes is interpreted in terms of the indirect pumping model.
Abstract: An alternative pump scheme, named indirect pump one is proposed to clarify its own feasibility. The high device performances of 8 µm quantum cascade lasers with cavity lengths of 4 mm and 1.5 mm are demonstrated: low threshold current densities of 2.7 and 3.3 kA/cm2 and maximum output powers of 362 and 50 mW at room temperature, and high T0-values of 243 and 303 K around room temperature. The higher T0-value, 303 K is the highest record ever reported with quantum cascade lasers. The high stability for temperature changes is interpreted in terms of the indirect pumping model.
69 citations
TL;DR: It is shown that the strong photon correlation, as induced by the atom, plays a very important role in stimulated emission and the temporal duration of the incident photon pulse is shown to have a marked effect on stimulating emission and atomic lifetime.
Abstract: We study stimulated emission from an excited two-level atom coupled to a waveguide containing an incident single-photon pulse. We show that the strong photon correlation, as induced by the atom, plays a very important role in stimulated emission. Additionally, the temporal duration of the incident photon pulse is shown to have a marked effect on stimulated emission and atomic lifetime.
69 citations
TL;DR: In this article, the authors demonstrate that near-threshold decay processes may be accelerated by repeated measurements, such as photodetachment of an electron from a negative ion, and spontaneous emission in a cavity close to the cutoff frequency or in a photon band-gap material.
Abstract: We demonstrate that near-threshold decay processes may be accelerated by repeated measurements. Examples include near-threshold photodetachment of an electron from a negative ion, and spontaneous emission in a cavity close to the cutoff frequency or in a photon band-gap material.
68 citations
TL;DR: In this article, an electrically injected AlGaN nanowire laser operating at 239 nm at room temperature was demonstrated and the spontaneous emission coupling factor was derived to be around 0.012.
Abstract: In this work, we report on the demonstration of an electrically injected AlGaN nanowire laser operating at 239 nm at room temperature. Vertically aligned Al-rich AlGaN nanowires are grown on Si substrate by plasma-assisted molecular beam epitaxy. It is observed that the randomly distributed AlGaN nanowires can strongly confine photons in the deep ultraviolet wavelength range, due to the recurrent multiple scattering of light and the inversely tapered nanowire geometry. The laser exhibits a very low threshold current of 0.35 mA at room temperature. From the detailed rate equation analysis, the spontaneous emission coupling factor is derived to be around 0.012.
68 citations