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Q: Fachverband Quantenoptik und Photonik
Q 3: Photonics I
Q 3.2: Vortrag
Montag, 10. März 2025, 11:30–11:45, HS Botanik
Effect of Disorder on Photonic Density of States — •Florin Hemmann1,2, Ullrich Steiner1,2, and Matthias Saba1,2 — 1Adolphe Merkle Institute, University of Fribourg, Switzerland — 2NCCR Bio-inspired Materials, University of Fribourg, Switzerland
Structural color arises from visible light interference in the presence of photonic nanostructures in many animals and plants [1]. As the dielectric contrast increases, such structures can form complete photonic band gaps, where light cannot enter the structure from any angle [2]. This phenomenon is well established for periodic systems, so-called photonic crystals. However, the emergence of a reduced photonic density of states due to the interplay of order and disorder in amorphous structures still needs to be fully understood. Here, we investigate how structural correlations at different length scales affect the photonic density of states. To this end, we generate 4-connected 3D continuous random networks with tunable disorder using a Metropolis Monte Carlo algorithm [3-4]. Utilizing a Monte Carlo bond-switch move, this algorithm simulates structural phase transitions from a crystalline to an amorphous diamond network. The effect of these structural phase transitions on the photonic response is analyzed through a finite-difference time-domain method and a planewave eigensolver method.
[1] V. V. Vogler-Neuling et al. (2024), Adv. Funct. Mater. 2024, 34, 2306528.
[2] J. D. Joannopoulos, et al. (2008), Princeton University Press.
[3] F. Wooten et al. (1985), Phys. Rev. Lett. 54, 1392.
[4] G. Barkema and N. Mousseau (1998), Phys. Rev. Lett. 81, 1865.
Keywords: photonic band gap; Monte Carlo; disordered photonics; structural color; nanophotonics