773 research outputs found
Sub-wavelength terahertz beam profiling of a THz source via an all-optical knife-edge technique
Terahertz technologies recently emerged as outstanding candidates for a variety of applications in such sectors as security, biomedical, pharmaceutical, aero spatial, etc. Imaging the terahertz field, however, still remains a challenge, particularly when sub-wavelength resolutions are involved. Here we demonstrate an all-optical technique for the terahertz near-field imaging directly at the source plane. A thin layer (<100 nm-thickness) of photo carriers is induced on the surface of the terahertz generation crystal, which acts as an all-optical, virtual blade for terahertz near-field imaging via a knife-edge technique. Remarkably, and in spite of the fact that the proposed approach does not require any mechanical probe, such as tips or apertures, we are able to demonstrate the imaging of a terahertz source with deeply sub-wavelength features (<30 μm) directly in its emission plane
Molecular identification of Trichogramma (Hymenoptera: trichogrammatidae) species, using the ITS2 region sequencing of the ribosomal DNA.
Populations genetic diversity of Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae), based on the sequencing of its2 region of the Ribosomal DNA.
Detection of wolbachia endosymbiont in populations of Trichogramma pretiosum Riley, 1879 (Hymenoptera: trichogrammatidae).
Aspectos morfológicos e citoquímicos das células sanguíneas de três espécies de quelônios recém eclodidos da Reserva Biológica do Abufari, Amazonas, Brasil.
Efeito da adubação nitrogenada no desempenho fisiológico de sementes de milho inoculadas com Azospirillum brasilense e Herbaspirillum seropedicae.
Parâmetros físicos e químicos da água durante as etapas de exportação da arraia Potamotrygon sp. (arraia cururu).
Eritrograma e bioquímica do plasma da arraia Paratrygon aiereba (Chondrichthyes: Potamotrygonidae) do Arquipélago Mariuá, médio Rio Negro, Amazonas.
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Influência das fases do crescimento sobre os aspectos hematológicos da arraia de água doce Potamotrygon motoro oriundas do Estado do Amazonas.
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