BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//UNIFR/WEBMASTER//NONSGML v1.0//EN
CALSCALE:GREGORIAN
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250825T160000
DTEND;VALUE=DATE:20250825T160000
UID:18296@agenda.unifr.ch
DESCRIPTION:A photonic band gap (PBG) is a range of frequencies in which no propagating states of light \nexist. PBGs can be engineered using dielectric arrangements structured on the length scale of \nthe light’s wavelength. Many biological species, from plants to insects, use this mechanism to \nproduce structural color through periodically crystalline and amorphous networks. These nets \ncan be characterized by their coordination number statistics - the number of edges joined at \neach vertex. Crystalline nets are well understood but show an intrinsically anisotropic optical \nresponse. Among these, the diamond net with a coordination number of 4 exhibits the largest \nknown PBG. There are examples of disordered networks in nature that exhibit a PBG \ncomparable to crystalline structures. An established Metropolis Monte Carlo algorithm \ngradually transforms the diamond net into a disordered photonic structure. However, nature \nemploys other network geometries, such as the chiral gyroid, which has a coordination number \nof 3. Here, we alter the conventional bond-bending energy in the Monte Carlo algorithm to \nenable a generalization to arbitrary coordination numbers. The photonic response of three \nnetworks with a mixed coordination number of 3 and 4 is investigated, and the band structure \nof the crystalline and disordered networks is analyzed. The differences in the photonic density \nof states of the network and a corresponding homogeneous medium are shown for these three \nnetworks.
SUMMARY:Computer-generated disordered networks for photonic band gaps
CATEGORIES:Autre
LOCATION:PER 08\,  2.73\, Chemin du Musée 3\, 1700 Fribourg
URL;VALUE=URI:https://agenda.unifr.ch/e/fr/18296
END:VEVENT
END:VCALENDAR