72 research outputs found
Microlasers based on effective index confined slow light modes in photonic crystal waveguides
We present the design, theory and experimental implementation of a low modal volume microlaser based on a line-defect 2D-photonic crystal waveguide. The lateral confinement of low-group velocity modes is controlled by the post-processing of 1 to 3μm wide PMMA strips on top of two dimensional photonic crystal waveguides. Modal volume around 1.3 (λ/n)3can be achieved using this scheme. We use this concept to fabricate microlaser devices from an InP-based heterostructure including InAs0.65P0.35quantum wells emitting around 1550nm and bonded onto a fused silica wafer. We observe stable, room-temperature laser operation with an effective lasing threshold around 0.5mW. © 2008 Optical Society of America
Mechanical relaxation of strained semiconducting stripes: Influence on optoelectronic properties
International audienc
Design and investigation of surface addressable Photonic Crystal cavity confined band edge modes for quantum photonic devices
We propose to use a localized G-point slow Bloch mode in a 2D-Photonic Crystal (PC) membrane to realize an efficient surface emitting source. This device can be used as a quantum photonic device, e.g. a single photon source. The physical mechanisms to increase the Q/V factor and to improve the directivity of the PC microcavity rely on a fine tuning of the geometry in the three directions of space. The PC lateral mirrors are first engineered in order to optimize photons confinement. Then, the effect of a Bragg mirror below the 2DPC membrane is investigated in terms of out-of-plane leakages and far field emission pattern. This photonic heterostructure allows for a strong lateral confinement of photons, with a modal volume of a few (λ/n)3 and a Purcell factor up to 80, as calculated by two different numerical methods. We finally discuss the efficiency of the single photon source for different collection set-up. © 2011 Optical Society of America
Nano-meter scale heterogeneous III-V semiconductor-silicon photonic integration
It is pointed out that the fully recognised and ever growing need for a combination of photonic and electronic functionalities could be made fully effective by the heterogeneous integration of active III-V semiconductor/passive silicon photonics and silicon microelectronics. It is shown that the inevitable scaling down to nano-meter range of photonic integration requested by the necessary matching to microelectronics is made possible by the heterogeneous association of IIIV semiconductor and silicon membranes including high index contrast and nano-meter scale structuring. It is emphasized that these membrane photonic nanostructures can be considered as the absolute must on the track to the ultimate confinement of photons which is highly desired in the prospect of the development of Micro-Nano-Photonic devices and systems. Examples of devices and systems along this approach are presented (micro-laser/micro-guide integration, active devices with very low threshold,...)
Room-temperature InAs/InP Quantum Dots laser operation based on heterogeneous “2.5 D” Photonic Crystal
International audienceThe authors report on the design, fabrication and operation of heterogeneous and compact "2.5 D" Photonic Crystal microlaser with a single plane of InAs quantum dots as gain medium. The high quality factor photonic structures are tailored for vertical emission. The devices consist of a top two-dimensional InP Photonic Crystal Slab, a SiO 2 bonding layer, and a bottom high index contrast Si/SiO 2 Bragg mirror deposited on a Si wafer. Despite the fact that no more than about 5% of the quantum dots distribution effectively contribute to the modal gain, room-temperature lasing operation, around 1.5µm, was achieved by photopumping. A low effective threshold, on the order of 350µW, and a spontaneous emission factor, over 0.13, could be deduced from experiments
Heterogeneous integration of electrically driven microdisk based laser sources for optical interconnects and photonic ICs
Tuneable Dual-Mode Micro-Resonator Associating Photonic Crystal Membrane and Fabry–Perot Cavity
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