Overall Aspects of Non-Traditional Glasses: Synthesis, Properties and Applications


Helena Cristina de Sousa Pereira Menezes e Vasconcelos, Maria Clara Gonçalves

DOI: 10.2174/97816810820731160101
eISBN: 978-1-68108-207-3, 2016
ISBN: 978-1-68108-208-0

Indexed in: EBSCO.

The considerable proliferation of new glasses during the second half of the 20th century (germanate, vanadate, bismuth...[view complete introduction]
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Photonic Bandgap Glass-Based Structures

- Pp. 107-130 (24)

M. Clara and Amadeu Griol


Photonic crystals (PCs) as it is often called photonic band gap materials (PBGs), are artificial composite materials, micro/nanostructured on an optical length scale (e.g. few hundreds of nm). The resulting periodicity in the dielectric constant is responsible for inhibiting light from propagating through the material as a result of Bragg diffraction. The forbidden frequency range is called a stop band. In PCs the electromagnetic waves within the band gap are completely reflected by the crystal, while spontaneous emission (within the band gap) are totally concealed. </p><p> This chapter introduces the physical concepts behind PC structures, along with bottomup fabrication methods, properties, and applications.

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