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Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Atomic Emission Spectroscopy: Lab01:29

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Antenas plasmónicas de bismuto

Michael Foltýn1, Tomáš Šikola1,2, Michal Horák1

  • 1Brno University of Technology, Central European Institute of Technology, Purkyňova 123, Brno 612 00, Czech Republic.

ACS nano
|September 1, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Las antenas de bismuto muestran resonancias plasmónicas sintonizables a través de espectros visibles e infrarrojos cercanos, correlacionando el tamaño y la forma de la antena con las propiedades ópticas. Esto posiciona el bismuto como una alternativa rentable al oro para aplicaciones plasmónicas.

Palabras clave:
el bismutoEspectroscopia de pérdida de energía de electronesplasmones de superficie localizadosla nanofotónicaLas antenas plasmónicas

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • Óptica

Sus antecedentes:

  • Los materiales plasmónicos permiten la manipulación de la luz a nanoescala.
  • El oro es un metal plasmónico común, pero es caro.
  • El bismuto ofrece ventajas teóricas en el ancho de banda espectral para los plasmónicos.

Objetivo del estudio:

  • Investigar experimentalmente la relación entre la geometría de la antena plasmónica de bismuto y las propiedades ópticas.
  • Evaluar el bismuto como una alternativa viable y de bajo costo al oro para dispositivos plasmónicos.

Principales métodos:

  • Fabricación de antenas de bismuto en forma de barra y corbata utilizando litografía de haz de iones enfocado.
  • Caracterización de la estructura de la antena y las propiedades ópticas mediante microscopía electrónica de transmisión de barrido y espectroscopia de pérdida de energía de electrones.

Principales resultados:

  • Las antenas de bismuto soportan resonancias plasmónicas de superficie localizadas.
  • Los modos de dipolo de la antena son sintonizables desde el infrarrojo cercano al espectro visible mediante la alteración del tamaño de la antena.
  • El bismuto exhibe una relación de dispersión de plasmones similar al oro, manteniendo el rendimiento a energías más altas.

Conclusiones:

  • Validación experimental de las propiedades plasmónicas sintonizables del bismuto basadas en el diseño de la antena.
  • El bismuto demuestra un rendimiento plasmónico comparable al oro, especialmente a energías más altas.
  • El bismuto es un material prometedor y rentable para aplicaciones plasmónicas avanzadas.