Water vapor at a translational temperature of one kelvin

We report the creation of a confined slow beam of heavy-water (D2O) molecules with a translational temperature around 1 kelvin. This is achieved by filtering slow D2O from a thermal ensemble with inhomogeneous static electric fields exploiting the quadratic Stark shift of D2O. All previous demonstrations of electric field manipulation of cold dipolar molecules rely on a predominantly linear Stark shift. Further, on the basis of elementary molecular properties and our filtering technique we argue that our D2O beam contains molecules in only a few ro-vibrational states.Comment: 4 pages, 4 figures, 1 tabl

Accountability for social impact: A bricolage perspective on impact measurement in social enterprises

his is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record To fulfill external accountability expectations social impact measurement has become an important practice for social enterprises. Yet, the ambiguity around social impact and its measurement leads to a friction among stakeholders involved in a social enterprise. Based on interviews with small-to-medium-sized social enterprises, this paper investigates how social entrepreneurs handle the increasing pressure to measure social impact with formal methodologies through a bricolage lens. The findings show how social enterprises combine material and ideational bricolage as well as seek to delegitimize formal methodologies to increase the legitimacy of their bricolaged approaches for social impact measurement

Multinational enterprises and climate change strategies

Climate change is often perceived as the most pressing environmental problem of our time, as reflected in the large public, policy, and corporate attention it has received, and the concerns expressed about the (potential) consequences. Particularly due to temperature increases, climate change affects physical and biological systems by changing ecosystems and causing extinction of species, and is expected to have a negative social impact and adversely affect human health (IPCC, 2007). Moreover, as a result of the economic costs and risks of extreme weather, climate change could have a severe impact on economic growth and development as well, if no action is taken to reduce emissions (Stern, 2006). This means that it can affect multinational enterprises (MNEs) active in a wide variety of sectors and countries. Climate change is not a 'purely' environmental issue because it is closely linked to concerns about energy security due to dependence on fossil fuels and oil in particular, and to energy efficiency and management more generally. Controversy about the climate change issue has led to a broadening of the agenda in some cases, with policy-makers targeting energy to avoid commotion about the science and politics of climate change, and firms likewise, also because addressing climate change in practice usually boils down to an adjustment in the energy base of business models

Characterization of a Quantum Light Source Based on Spontaneous Parametric Down-Conversion

We have built a quantum light source capable of producing different types of quantum states. The quantum light source is based on entangled state preparation in the process of spontaneous parametric down-conversion. The single-photon detection rate of eight-hundred thousand per second demonstrates that we have created a bright state-of-the-art quantum light source. As a part of the characterization we measured two-photon quantum interference in a Hong-Ou-Mandel interferometer.Comment: 33 page

Nanophotonic hybridization of narrow atomic cesium resonances and photonic stop gaps of opaline nanostructures

We study a hybrid system consisting of a narrowband atomic optical resonance and the long-range periodic order of an opaline photonic nanostructure. To this end, we have infiltrated atomic cesium vapor in a thin silica opal photonic crystal. With increasing temperature, the frequencies of the opal's reflectivity peaks shift down by >20% due to chemical reduction of the silica. Simultaneously, the photonic bands and gaps shift relative to the fixed near-infrared cesium D1 transitions. As a result the narrow atomic resonances with high finesse (f/df=8E5) dramatically change shape from a usual dispersive shape at the blue edge of a stop gap, to an inverted dispersion lineshape at the red edge of a stop gap. The lineshape, amplitude, and off-resonance reflectivity are well modeled with a transfer-matrix model that includes the dispersion and absorption of Cs hyperfine transitions and the chemically-reduced opal. An ensemble of atoms in a photonic crystal is an intriguing hybrid system that features narrow defect-like resonances with a strong dispersion, with potential applications in slow light, sensing and optical memory.Comment: 8 pages, 6 figure

Optical decay from a Fabry-Perot cavity faster than the decay time

The dynamical response of an optical Fabry-Perot cavity is investigated experimentally. We observe oscillations in the transmitted and reflected light intensity if the frequency of the incoupled light field is rapidly changed. In addition, the decay of a cavity-stored light field is accelerated if the phase and intensity of the incoupled light are switched in an appropriate way. The theoretical model by M. J. Lawrence em et al, JOSA B 16, 523 (1999) agrees with our observations.Comment: submitted to Josa