title: Coherently Tunable Triangular Trefoil Phaseonium Metamaterial.
abstract: Phaseonium is a three-level Λ quantum system, in which a coherent microwave and an optical control (pump) beams can be used to actively modulate the dielectric response. Here we propose a new metamaterial structure comprising of a periodic array of triangular phaseonium metamolecules arranged as a trefoil. We present a computational study of the spatial distribution of magnetic and electric fields of the probe light and the corresponding transmission and reflection, for various parameters of the optical and microwave beams. For specific values of the probing frequencies and control fields, the phaseonium can display either metallic or dielectric optical response. We find that, in the metallic regime, the phaseonium metamaterial structure supports extremely large transmission, with optical amplification at large enough intensity of the microwave thanks to strong surface plasmon coupling; while, in the dielectric regime without microwave excitation, the transmission bandwidth can be tuned by varying the control beam intensity. Implementation of such phaseonium metamaterial structure in solid-state systems, such as patterned crystals doped with rare-earth elements or dielectric matrices embedded with quantum dots, could enable a new class of actively tunable quantum metamaterials.
authors.affiliation: Centre for disruptive photonic technologies, Nanyang Technological University, Singapore, 637371.|CINTRA CNRS/NTU/Thales, UMI 3288, Research Techno Plaza, Singapore 637553.
authors.forename: D M
authors.initials: DM
authors.lastname: Nguyen
authors.affiliation: Centre for disruptive photonic technologies, Nanyang Technological University, Singapore, 637371.
authors.forename: Cesare
authors.initials: C
authors.lastname: Soci
authors.affiliation: Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: C H Raymond
authors.initials: CH
authors.lastname: Ooi