Metasurfaces at Terahertz: Communications, Sensing and Invisibility Cloaks

CIC nanoGUNE Seminars

Miguel Beruete, Associate Professor, Universidad Pública de Navarra (UPNA)
nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
Add to calendar
Subscribe to Newsletter
Metasurfaces at Terahertz: Communications, Sensing and Invisibility Cloaks ** ** **Metasurfaces at Terahertz: Communications, Sensing and Invisibility Cloaks** Miguel Beruete Antennas Group-TERALAB Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain Multispectral Biosensing Group Navarrabiomed Complejo Hospitalario de Navarra (CHN) Universidad Pública de Navarra (UPNA) IdiSNA. Irunlarrea 3, 31008 Pamplona, Navarra, Spain Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain []( Metasurfaces are screens engineered to manipulate light in exotic and unconventional ways. They are the latest evolution of metamaterials and like them, are made of small metallic or dielectric pieces, called unit cells, whose shape and arrangement govern the response of the device in a very compact structure, ideally a single layer. Metasurfaces are nowadays under intense research in electromagnetics and currently have given rise to disruptive devices such as planar lenses, beam-steerers, beam-splitters, polarizers, reaching even exotic performances like hologram generators, invisibility cloaks, sensors, etc., all along the electromagnetic spectrum, from microwaves to the ultraviolet [1,2]. Although they are being investigated all along the electromagnetic spectrum, metasurfaces are being crucial in the technological development of the terahertz (THz) band. This range between microwaves and infrared has remained elusive until recently, due to the intrinsic difficulties in generating and detecting this radiation. However, in the last decades a new surge of interest has emerged due to the discovery of novel transmitters and receivers in this band. Metasurfaces are helping to bridge the technological gap at THz, giving rise to devices able to manipulate the THz beam in a compact footprint and with the possibility of achieving multifunctional operation. In this talk, I will summarize some of our most recent and provocative results related with THz metasurfaces. I will show communication devices such as compact metalenses [3]; a metasurface able to hide an object on the ground acting effectively as an invisibility cloak [4]; and our latest advances on THz sensing using metasurfaces with intricate shape, so called metageometries [5,6]. **References** 1\. S. B. Glybovski, S. A. Tretyakov, P. A. Belov, Y. S. Kivshar, and C. R. Simovski, "Metasurfaces: From microwaves to visible," Phys. Rep. **634** , 1–72 (2016). 2\. K. Huang, F. Qin, H. Liu, H. Ye, C. W. Qiu, M. Hong, B. Luk’yanchuk, and J. Teng, "Planar Diffractive Lenses: Fundamentals, Functionalities, and Applications," Adv. Mater. **30** , 1–22 (2018). 3\. V. Pacheco-Peña, N. Engheta, S. A. Kuznetsov, A. Gentselev, and M. Beruete, "Experimental Realization of an Epsilon-Near-Zero Graded-Index Metalens at Terahertz Frequencies," Phys. Rev. Appl. **8** , 034036 (2017). 4\. B. Orazbayev, N. Mohammadi Estakhri, A. Alù, and M. Beruete, "Experimental Demonstration of Metasurface-Based Ultrathin Carpet Cloaks for Millimeter Waves," Adv. Opt. Mater. **5** , 1600606 (2017). 5\. I. Jáuregui-López, P. Rodríguez-Ulibarri, A. Urrutia, S. A. Kuznetsov, and M. Beruete, "Labyrinth Metasurface Absorber for Ultra-High-Sensitivity Terahertz Thin Film Sensing," Phys. status solidi - Rapid Res. Lett. **12** , 1800375 (2018). 6\. I. Jáuregui-López, P. Rodríguez-Ulibarri, S. A. Kuznetsov, C. Quemada, and M. Beruete, "Labyrinth Metasurface for Biosensing Applications: Numerical Study on the New Paradigm of Metageometries," Sensors **19** , 4396 (2019). **Host:** R. Hillenbrand