A proposal for highly tunable optical parametric oscillation in silicon micro-resonators

We propose a novel scheme for continuous-wave pumped optical parametric oscillation (OPO) inside silicon micro-resonators. The proposed scheme not only requires a relative low lasing threshold, but also exhibits extremely broad tunability extending from the telecom band to mid infrared

Proof-of-principle of surface detection with air-guided quantum cascade lasers

We report a proof-of-principle of surface detection with air-guided quantum cascade lasers. Laser ridges were designed to exhibit an evanescent electromagnetic field on their top surface that can interact with material or liquids deposited on the device. We employ photoresist and common solvents to provide a demonstration of the sensor setup. We observed spectral as well as threshold currents changes as a function of the deposited material absorption curve. A simple model, supplemented by 2D numerical finite element method simulations, allows one to explain and correctly predict the experimental results

Nanoscale quantum dot infrared sensors with photonic crystal cavity

We report high performance infrared sensors that are based on intersubband transitions in nanoscale self-assembled quantum dots combined with a microcavity resonator made with a high-index-contrast two-dimensional photonic crystal. The addition of the photonic crystal cavity increases the photocurrent, conversion efficiency, and the signal to noise ratio (represented by the specific detectivity D*) by more than an order of magnitude. The conversion efficiency of the detector at Vb=–2.6 V increased from 7.5% for the control sample to 95% in the PhC detector. In principle, these photonic crystal resonators are technology agnostic and can be directly integrated into the manufacturing of present day infrared sensors using existing lithographic tools in the fabrication facility

Casos de buenas prácticas en el uso de pequeños generadores con energías renovables

La Matriz Energética Argentina requiere promover su diversificación incentivando la generación eléctrica distribuida, con recursos renovables locales, por parte de pequeños consumidoresproductores inyectando la energía generada a la red de baja tensión. Con este objetivo esta ponencia, elaborada con una mirada integradora que trata de incorporar el uso de las energías renovables al colectivo social y las políticas urbanas locales, se desarrolla conforme a dos aspectos que se consideran significativos: El marco normativo, infiriendo que su existencia y/o sanción debería alentar la generación eléctrica distribuida en bajas potencias, con incorporación al sistema interconectado. El enfoque instrumental a través del análisis de casos - buenas prácticas. Se consideran buenas prácticas a las acciones destinadas a mejorar las condiciones de vida de la comunidad. Conocerlas permite compartir experiencias valiosas incrementando el grado de conciencia de quienes toman decisiones sobre soluciones potenciales a los problemas sociales, económicos y medio ambientales locales.Argentina Energy Matrix requires promoting its diversification by encouraging the distributed electricity generation, with local renewable resources, by small consumers-producers incorporating their generated energy to the distribution networks in low voltage. With this objective this paper, made with an integrative look that seeks to incorporate the use of renewable energies to the collective social and local urban policies, develops according to two aspects that are considered significant: Normative framework, inferring that their existence and/or enactment should encourage the distributed electricity generation in low powers, with incorporation to the grid. Instrumental approach through the analysis of cases - good practice. It is considered good practice to actions designed to improve the living conditions of the community. To know them allows to share valuable experiences increasing the level of awareness of those who take decisions on potential solutions to social problems, economic and environmental premises.Tema 13: Generación distribuida.Facultad de Arquitectura y Urbanism

Casos de buenas prácticas en el uso de pequeños generadores con energías renovables

La Matriz Energética Argentina requiere promover su diversificación incentivando la generación eléctrica distribuida, con recursos renovables locales, por parte de pequeños consumidoresproductores inyectando la energía generada a la red de baja tensión. Con este objetivo esta ponencia, elaborada con una mirada integradora que trata de incorporar el uso de las energías renovables al colectivo social y las políticas urbanas locales, se desarrolla conforme a dos aspectos que se consideran significativos: El marco normativo, infiriendo que su existencia y/o sanción debería alentar la generación eléctrica distribuida en bajas potencias, con incorporación al sistema interconectado. El enfoque instrumental a través del análisis de casos - buenas prácticas. Se consideran buenas prácticas a las acciones destinadas a mejorar las condiciones de vida de la comunidad. Conocerlas permite compartir experiencias valiosas incrementando el grado de conciencia de quienes toman decisiones sobre soluciones potenciales a los problemas sociales, económicos y medio ambientales locales.Argentina Energy Matrix requires promoting its diversification by encouraging the distributed electricity generation, with local renewable resources, by small consumers-producers incorporating their generated energy to the distribution networks in low voltage. With this objective this paper, made with an integrative look that seeks to incorporate the use of renewable energies to the collective social and local urban policies, develops according to two aspects that are considered significant: Normative framework, inferring that their existence and/or enactment should encourage the distributed electricity generation in low powers, with incorporation to the grid. Instrumental approach through the analysis of cases - good practice. It is considered good practice to actions designed to improve the living conditions of the community. To know them allows to share valuable experiences increasing the level of awareness of those who take decisions on potential solutions to social problems, economic and environmental premises.Tema 13: Generación distribuida.Facultad de Arquitectura y Urbanism

Casos de buenas prácticas en el uso de pequeños generadores con energías renovables

La Matriz Energética Argentina requiere promover su diversificación incentivando la generación eléctrica distribuida, con recursos renovables locales, por parte de pequeños consumidoresproductores inyectando la energía generada a la red de baja tensión. Con este objetivo esta ponencia, elaborada con una mirada integradora que trata de incorporar el uso de las energías renovables al colectivo social y las políticas urbanas locales, se desarrolla conforme a dos aspectos que se consideran significativos: El marco normativo, infiriendo que su existencia y/o sanción debería alentar la generación eléctrica distribuida en bajas potencias, con incorporación al sistema interconectado. El enfoque instrumental a través del análisis de casos - buenas prácticas. Se consideran buenas prácticas a las acciones destinadas a mejorar las condiciones de vida de la comunidad. Conocerlas permite compartir experiencias valiosas incrementando el grado de conciencia de quienes toman decisiones sobre soluciones potenciales a los problemas sociales, económicos y medio ambientales locales.Argentina Energy Matrix requires promoting its diversification by encouraging the distributed electricity generation, with local renewable resources, by small consumers-producers incorporating their generated energy to the distribution networks in low voltage. With this objective this paper, made with an integrative look that seeks to incorporate the use of renewable energies to the collective social and local urban policies, develops according to two aspects that are considered significant: Normative framework, inferring that their existence and/or enactment should encourage the distributed electricity generation in low powers, with incorporation to the grid. Instrumental approach through the analysis of cases - good practice. It is considered good practice to actions designed to improve the living conditions of the community. To know them allows to share valuable experiences increasing the level of awareness of those who take decisions on potential solutions to social problems, economic and environmental premises.Tema 13: Generación distribuida.Facultad de Arquitectura y Urbanism

Quantum Cascade Microdisk Lasers for Mid Infrared Intra-Cavity Sensing

The design, fabrication, and testing of surface sensitive quantum cascade microdisk lasers in the mid-infrared for intra-cavity spectroscopy and integration with microfluidic delivery is presented

Surface-plasmon mode hybridization in subwavelength microdisk lasers

Hybridization of surface-plasmon and dielectric waveguide whispering-gallery modes are demonstrated in a semiconductor microdisk laser cavity of subwavelength proportions. A metal layer is deposited on top of the semiconductor microdisk, the radius of which is systematically varied to enable mode hybridization between surface-plasmon and dielectric modes. The anticrossing behavior of the two cavity mode types is experimentally observed via photoluminescence spectroscopy and optically pumped lasing action at a wavelength of λ ~1.3 µm is achieved at room temperature

Demonstration of air-guided quantum cascade lasers without top claddings

We report on quantum cascade lasers employing waveguides based on a predominant air confinement mechanism in which the active region is located immediately at the device top surface. The lasers employ ridge-waveguide resonators with narrow lateral electrical contacts only, with a large, central top region not covered by metallization layers. Devices based on this principle have been reported in the past; however, they employed a thick, doped top-cladding layer in order to allow for uniform current injection. We find that the in-plane conductivity of the active region - when the material used is of high quality - provides adequate electrical injection. As a consequence, the devices demonstrated in this work are thinner, and most importantly they can simultaneously support air-guided and surface-plasmon waveguide modes. When the lateral contacts are narrow, the optical mode is mostly located below the air-semiconductor interface. The mode is predominantly air-guided and it leaks from the top surface into the surrounding environment, suggesting that these lasers could be employed for surface-sensing applications. These laser modes are found to operate up to room temperature under pulsed injection, with an emission spectrum centered around λ ≃ 7:66 μm