000219340 001__ 219340
000219340 005__ 20181203024245.0
000219340 0247_ $$2doi$$a10.1038/ncomms11216
000219340 022__ $$a2041-1723
000219340 02470 $$2ISI$$a000373826600001
000219340 037__ $$aARTICLE
000219340 245__ $$aNear optimal graphene terahertz non-reciprocal isolator
000219340 260__ $$bNature Publishing Group$$c2016$$aLondon
000219340 269__ $$a2016
000219340 300__ $$a6
000219340 336__ $$aJournal Articles
000219340 520__ $$aIsolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important open challenge made difficult by the intrinsically lossy propagation of terahertz radiation in current non-reciprocal materials. Here we report the design, fabrication and measurement of a terahertz non-reciprocal isolator for circularly polarized waves based on magnetostatically biased monolayer graphene, operating in reflection. The device exploits the non-reciprocal optical conductivity of graphene and, in spite of its simple design, it exhibits almost 20 dB of isolation and only 7.5 dB of insertion loss at 2.9 THz. Operation with linearly polarized light can be achieved using quarter-wave plates as polarization converters. These results demonstrate the superiority of graphene with respect to currently used terahertz non-reciprocal materials and pave the way to a novel class of optimal non-reciprocal devices.
000219340 700__ $$0246252$$g218702$$uEcole Polytech Fed Lausanne, Lab Electromagnet & Antennas LEMA, Stn 11, CH-1015 Lausanne, Switzerland$$aTamagnone, Michele
000219340 700__ $$uEcole Polytech Fed Lausanne, Nanoelect Devices Lab NANOLAB, Stn 11, CH-1015 Lausanne, Switzerland$$aMoldovan, Clara
000219340 700__ $$uUniv Geneva, Dept Quantum Matter Phys DQMP, Quai Ernest Ansermet 24, CH-1211 Geneva 4, Switzerland$$aPoumirol, Jean-Marie
000219340 700__ $$uUniv Geneva, Dept Quantum Matter Phys DQMP, Quai Ernest Ansermet 24, CH-1211 Geneva 4, Switzerland$$aKuzmenko, Alexey B.
000219340 700__ $$0241430$$g122431$$uEcole Polytech Fed Lausanne, Nanoelect Devices Lab NANOLAB, Stn 11, CH-1015 Lausanne, Switzerland$$aIonescu, Adrian M.
000219340 700__ $$g105917$$uEcole Polytech Fed Lausanne, Lab Electromagnet & Antennas LEMA, Stn 11, CH-1015 Lausanne, Switzerland$$aMosig, Juan R.$$0240432
000219340 700__ $$aPerruisseau-Carrier, Julien$$g118757$$0240689
000219340 773__ $$j7$$tNature Communications$$q11216
000219340 909C0 $$xU10328$$0252177$$pNANOLAB
000219340 909C0 $$xU12441$$0252403$$pMNWAVE
000219340 909C0 $$xU10374$$0252091$$pLEMA
000219340 909CO $$pSTI$$particle$$ooai:infoscience.tind.io:219340
000219340 917Z8 $$x198278
000219340 937__ $$aEPFL-ARTICLE-219340
000219340 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000219340 980__ $$aARTICLE