Ultrafast nonreciprocal transmission modulation in metasurfaces with epsilon-near-zero materials
Nonreciprocity refers to the difference in received to transmitted ratio when the source and detector are interchanged [1]. Optical isolator - component which allows transmission in one direction - is a canonical example of a nonreciprocal device. Nonreciprocity can be achieved through three known pathways; (i) materials with asymmetric permittivity or permeability tensors, such as ferrites; (ii) nonlinear light-matter interactions[2-4]; and (iii) time-varying systems[5]. While traditionally nonreciprocal components are quite large in size, nanofabrication of metasurfaces has enabled their miniaturisation to the nanoscale. However, ultrafast nonreciprocal responses at the nanoscale remain still a challenge. Here we design and study metasurface with an epsilon near zero material indium tin oxide (ITO) that enables ultrafast switching of refractive index via Kerr nonlinearity, in order to achieve optical isolation. 2025 IEEE.
Mathew, Albert; Aschwanden, Rebecca; Tripathi, Aditya; Jangid, Piyush; Sain, Basudeb; Zentgraf, Thomas; Kruk, Sergey
2025 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2025;
Institute of Electrical and Electronics Engineers Inc.
Restricted Access; Hardcopy may be available in the library
https://doi.org/10.1109/CLEO/EUROPE-EQEC65582.2025.11111523 https://www.scopus.com/pages/publications/105016149136?origin=resultslist
Mathew A., Research School of Physics, The Australian National University, Canberra, 2601, Australia; Aschwanden R., Department of Physics, Paderborn University, Paderborn, 33098, Germany; Tripathi A., Research School of Physics, The Australian National University, Canberra, 2601, Australia; Jangid P., Research School of Physics, The Australian National University, Canberra, 2601, Australia; Sain B., Department of Physics, Paderborn University, Paderborn, 33098, Germany, Department of Physics and Electronics, Christ University, Bangalore, 560029, India; Zentgraf T., Department of Physics, Paderborn University, Paderborn, 33098, Germany; Kruk S., Australian Research Council CoE QUBIC, IBMD, MaPS, University of Technology, Sydney, 2007, Australia