Thermal properties and two-dimensional photonic band gaps

• Published in: Journal of modern optics Vol. 61; no. 5; pp. 385 - 389
• Main Authors: Elsayed, Hussein A., El-Naggar, Sahar A., Aly, Arafa H.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 12.03.2014; Taylor & Francis Ltd
• Subjects: Band gap; Crystal lattices; Mathematical analysis; omnidirectional band; Optics; photonic band gap; Photonic band gaps; Photonic crystals; Photonics; plane-wave expansion method; Rods; Room temperature; Silicon; Temperature; Temperature effects; Temperature sensors; Thermal expansion; Thermal properties; Thermodynamic properties; Two dimensional; two-dimensional photonic crystal
• ISSN: 0950-0340; 1362-3044
• DOI: 10.1080/09500340.2014.887155

The effect of temperature on a two-dimensional square lattice photonic crystal composed of Si rods arranged in an air background was investigated theoretically using the plane-wave expansion method. Both the thermal expansion effect and thermo-optical effect are considered simultaneously. We have discussed the role of temperature in creating the complete photonic band gap as a function of temperature. Two different shapes of rods, i.e. square and circular, are considered in the presence of the two polarization states, i.e. TE and TM waves. The numerical results show that the photonic band gap can be significantly enlarged compared to the photonic band gap at room temperature. The effect of temperature on the complete photonic band width in the cylindrical rods case is more significant. Cylindrical and square Si rods may work as a temperature sensor or filter, among many other potential applications.