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NVC
Nāgpur, India

Active in situ control of light at the nanoscale remains a challenge in modern physics and in nanophotonics in particular. A promising approach is to take advantage of the technological maturity of nanoelectromechanical systems (NEMS) and combine the technology with on-chip optics, but the integration of such small devices with optical fields remains difficult. In a recent work published in Nature Communications, ICFO researchers Dr. Antoine Reserbat-Plantey, Kevin G. Schadler, and Dr. Louis Gaudreau, led by ICREA Professors at ICFO Frank H. L. Koppens and Adrian Bachtold and ICFO Professor Darrick Chang, have presented a novel type of hybrid system consisting of an on-chip graphene NEMS suspended a few tens of nanometres above nitrogen-vacancy centres (NVCs), which are stable, single-photon emitters embedded in nanodiamonds. Their work has confirmed that graphene is an ideal platform for both nanophotonics and nanomechanics. For their study, the researchers fabricated such an original hybrid device for the first time. Due to its electromechanical properties, graphene NEMS can be actuated and deflected electrostatically over few tens of nanometres with modest voltages applied to a gate electrode. The graphene motion can thus be used to modulate the light emission by the NVC, while the emitted field can be used as a universal probe of the graphene position. The optomechanical coupling between the graphene displacement and the NVC emission is based on near-field dipole-dipole interactions. The researchers could see that the coupling strength increases strongly for shorter distances and is enhanced because of graphene's two-dimensional (2D) character and linear dispersion. These achievements hold promise for selective control of emitter arrays on-chip, optical spectroscopy of individual nano-objects, integrated optomechanical information processing, and opens new avenues toward quantum optomechanics. More information: Antoine Reserbat-Plantey et al. Electromechanical control of nitrogen-vacancy defect emission using graphene NEMS, Nature Communications (2016). DOI: 10.1038/ncomms10218


Abstract: Active in situ control of light at the nanoscale remains a challenge in modern physics and in nanophotonics in particular. A promising approach is to take advantage of the technological maturity of nanoelectromechanical systems (NEMS) and combine it with on-chip optics, but the integration of such small devices with optical fields remains difficult. In a recent work published in Nature Communications, ICFO researchers Dr. Antoine Reserbat-Plantey, Kevin G. Schadler, and Dr. Louis Gaudreau, led by ICREA Professors at ICFO Frank H. L. Koppens and Adrian Bachtold and ICFO Professor Darrick Chang, have presented a novel type of hybrid system, consisting of an on-chip graphene NEMS suspended a few tens of nanometres above nitrogen-vacancy centres (NVCs), which are stable single-photon emitters embedded in nanodiamonds. Their work has confirmed that graphene is an ideal platform for both nanophotonics and nanomechanics. For their study the team of researchers fabricated for the first time such an original hybrid device. Due to its electromechanical properties, graphene NEMS can be actuated and deflected electrostatically over few tens of nanometres with modest voltages applied to a gate electrode. The graphene motion can thus be used to modulate the light emission by the NVC, while the emitted field can be used as a universal probe of the graphene position. The optomechanical coupling between the graphene displacement and the NVC emission is based on near-field dipole-dipole interactions. The researchers were able to see that the coupling strength increases strongly for shorter distances and is enhanced because of graphene's two-dimensional (2D) character and linear dispersion. These achievements hold promise for selective control of emitter arrays on-chip, optical spectroscopy of individual nano-objects, integrated optomechanical information processing, and opens new avenues towards quantum optomechanics. About ICFO-The Institute of Photonic Sciences ICFO-The Institute of Photonic Sciences is a center of research excellence devoted to the science and technologies of light with a triple mission: to conduct frontier research, train the next generation of scientists, and provide knowledge and technology transfer. Research at ICFO targets the forefront of science and technology based on light with programs directed at applications in Health, Renewable Energies, Information Technologies, Security and Industrial processes, among others. The institute hosts 300 professionals based in a dedicated building situated in the Mediterranean Technology Park in the metropolitan area of Barcelona. ICFO participates in a large number of projects and international networks of excellence and is host to the NEST program financed by Fundación Privada Cellex Barcelona. ICFO is a member of the Severo Ochoa Excellence program and a membre of the Barcelona Institute of Science and Technology. For more information, please click If you have a comment, please us. Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.


Sonkusale P.,NVC | Bhandarker A.G.,NVC | Kurkare N.V.,NVC | Ravikanth K.,Ayurvet Ltd | And 2 more authors.
International Journal of Poultry Science | Year: 2011

A 6 week long experimental trial was conducted to study whether the supplementation of herbal products Superliv liq. and Repchol (supplied by M/S Ayurvet Limited, Baddi, India) are efficacious in treatment of liver and kidney due to CCL4 A total of 75 Cobb day old broilers were divided into three equal groups (n = 25). Group A served as negative control, group B (positive control) and C (treatment group) were induced with FLKS with CCL4 @1 ml/kg body weight orally, administered every 3rd day during 15-28 days of trial. Treated group C were given Superliv Liq. @5 ml/100 chicks/day for first 2 weeks and @ 10 ml/100 chicks/day for 3-6 weeks along with drinking water in combination with Repchol@500 gm/ton of feed from 0-6 weeks. Fatty liver and kidney syndrome lead to depression in growth rate, lowered feed efficiency and disturbances in immunopathological and biochemical parameters. Final mean body weight of group C was significantly (p<0.01) higher than group A and B. A significant (p<0.01) decrease in feed conversion ratio was observed in group C as compared to group B. A significant (p<0.01) decrease in level of cholesterol, triglycerides, HDL, VLDL, creatinine, liver enzymes (SGOT and SGPT) and increase in serum protein level was recorded in group C as compared to group B on 28th and 42nd day of experiment, which was in confirmation with the values of negative control group A, falling into normal range. Gross and histopathology of liver and kidney revealed that there was mild congestion and negligible degenerative changes in group C in contrast to severe changes of FLKS syndrome in group B. It can be concluded that liver tonic Superliv liquid along with phytoadditive Repchol (supplement for choline and biotin) efficaciously ameliorated the CCL4 induced toxicity, when administered prophylactically in broilers. © Asian Network for Scientific Information, 2011.


Banerjee R.,NVC | Verma A.K.,GPT Laboratory | Das A.K.,GPT Laboratory | Rajkumar V.,GPT Laboratory | And 2 more authors.
Meat Science | Year: 2012

The antioxidant potential of broccoli powder extract (BPE) was determined and evaluated in goat meat nuggets at three different levels 1, 1.5 and 2%, compared with control and butylated hydroxyl toluene (100. ppm BHT). Total phenolics in 5. mg broccoli powder was higher (P< 0.05) than 100. ppm BHT. Free radical scavenging activity of 2.25. mg and 3. mg broccoli powder was found similar to 50 and 100. ppm BHT. Reducing power of 10. mg broccoli powder was comparable to the 100. ppm BHT. Incorporation of 1.5 and 2% BPE decreased (P< 0.05) the pH value of the products. Total phenolics in product with 2% BPE was similar to BHT nuggets. Chroma value of products with 1.5 and 2% BPE was lower (P< 0.05) than control and BHT nuggets. Thiobarbituric acid reactive substances number of BPE nuggets was lower (P< 0.05) than control throughout the storage. Thus 2% BPE can be used as natural antioxidant in goat meat nuggets without affecting product acceptability. © 2012 Elsevier Ltd.

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