Hybrid confinement of optical and mechanical modes in a bullseye optomechanical resonator

Optomechanical cavities have proven to be an exceptional tool to explore fundamental and technological aspects of the interaction between mechanical and optical waves. Such interactions strongly benefit from cavities with large optomechanical coupling, high mechanical and optical quality factors, and mechanical frequencies larger than the optical mode linewidth, the so called resolved sideband limit. Here we demonstrate a novel optomechanical cavity based on a disk with a radial mechanical bandgap. This design confines light and mechanical waves through distinct physical mechanisms which allows for independent control of the mechanical and optical properties. Our device design is not limited by unique material properties and could be easily adapted to allow large optomechanical coupling and high mechanical quality factors with other promising materials. Finally, our demonstration is based on devices fabricated on a commercial silicon photonics facility, demonstrating that our approach can be easily scalable.Comment: 16 pages, 11 figure

Aspectos importantes para a obtenção de leite de cabra com qualidade.

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Coalhada caprina dessorada e adicionada de polpa de frutos tropicais.

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Processamento do queijo andino caprino maturado e defumado.

bitstream/CNPC-2010/23035/1/cot105.pdfPrática / Processo agropecuário

Processamento de ricota a partir do soro de queijos de cabra.

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Ultrahigh-Q optomechanical crystal cavities fabricated in a CMOS foundry

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESPhotonic crystals use periodic structures to create frequency regions where the optical wave propagation is forbidden, which allows the creation and integration of complex optical functionalities in small footprint devices. Such strategy has also been successfully applied to confine mechanical waves and to explore their interaction with light in the so-called optomechanical cavities. Because of their challenging design, these cavities are traditionally fabricated using dedicated high-resolution electron-beam lithography tools that are inherently slow, limiting this solution to small-scale or research applications. Here we show how to overcome this problem by using a deep-UV photolithography process to fabricate optomechanical crystals in a commercial CMOS foundry. We show that a careful design of the photonic crystals can withstand the limitations of the photolithography process, producing cavities with measured intrinsic optical quality factors as high as Q(i) = (1.21 +/- 0.02) x 10(6). Optomechanical crystals are also created using phononic crystals to tightly confine the GHz sound waves within the optical cavity, resulting in a measured vacuum optomechanical coupling rate of g(0) = 2 pi x (91 +/- 4) kHz. Efficient sideband cooling and amplification are also demonstrated since these cavities are in the resolved sideband regime. Further improvements in the design and fabrication process suggest that commercial foundry-based optomechanical cavities could be used for quantum ground-state cooling.716FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES2012/17610-32012/17765-72013/06360-92014/12875-42016/18308-0550504/2012-5153044/2013-6Sem informaçãoR.B., G.S.W. and T.P.M.A. designed the devices. R.B. performed the measurements with support from F.G.S.S., G.O.L. and supervision by T.P.M.A., R.B., G.S.W. and T.P.M.A. analyzed the measured data. All authors contributed to the writing of the manuscript

Queijo de cabra maturado adicionado de pasta de pimentão.

bitstream/item/58378/1/COT-125.pdfPrática / Processo Agropecuári

Avaliação da aceitação de queijos caprinos em teste de locação central.

Resumo: A Embrapa Caprinos e Ovinos participou do Circuito Brasileiro de Degustação de Vinhos, em Fortaleza, Ceará, realizando a degustação de oito variedades de queijos caprinos, e três delas foram avaliadas como objeto de estudo de um projeto de transferência de tecnologias para agregação de valor e incentivo ao setor da caprinocultura leiteira. Os três queijos, Coalho adicionado de óleo de Pequi (Caryocar brasiliensis), Coalho Maturado e Defumado e o queijo Cremoso Probiótico foram avaliados quanto à aceitação sensorial por meio de oitenta e nove questionários respondidos por participantes do evento, utilizando-se uma escala hedônica de sete pontos e questões relativas a hábitos de consumo e atitudes de compra. Todos os queijos avaliados foram bem aceitos, principalmente o queijo de Coalho maturado e defumado, despertando o interesse dos setores participantes do evento, bem como dos potenciais consumidores com relação à previsão de comercialização desses produtos