Controllable finite ultra-narrow quality-factor peak in a perturbed Dirac-cone band structure of a photonic-crystal slab
Alex Y. Song, Akhil Raj Kumar Kalapala, Ricky Gibson, Kevin James Reilly, Thomas Rotter, Sadhvikas Addamane, Haiwen Wang, Cheng Guo, Ganesh Balakrishnan, Robert Bedford, Weidong Zhou, Shanhui Fan
Abstract
We show that by using a perturbed photonic Dirac-cone, one can realize an ultra-narrow and finite Q-factor peak in the wavevector space, with both the peak value and the width separately tunable. We also discuss a lower bound in the minimal viable width given a peak Q-value while maintaining sufficient Q differentiation among modes. The strong angular and frequency Q-selection finds applications in optical devices where strong angle- and frequency-selections are needed.
Topics & Concepts
SlabPhysicsUpper and lower boundsWave vectorOpticsCondensed matter physicsQ factorPhotonicsElectronic band structurePhotonic crystalFinite element methodMaterials scienceFinite thicknessComputational physicsValue (mathematics)OptoelectronicsReflection (computer programming)Mathematical analysisBroadbandWaveguideFrequency bandPhotonic Crystals and ApplicationsTopological Materials and PhenomenaMetamaterials and Metasurfaces Applications