Science - USA (2019-01-04)

136. D. Dai, Y. Tang, J. E. Bowers, Mode conversion in tapered
     submicron silicon ridge optical waveguides.Opt. Express 20 ,
     13425 – 13439 (2012). doi:10.1364/OE.20.013425;pmid:22714370


137. Z. Zhang, X. Hu, J. Wang, On-chip optical mode exchange
     using tapered directional coupler.Sci. Rep. 5 , 16072 (2015).
     doi:10.1038/srep16072; pmid: 26530728


138. T. Goldzak, A. A. Mailybaev, N. Moiseyev, Light
     stops at exceptional points.Phys. Rev. Lett. 120 ,
     013901 (2018). doi:10.1103/PhysRevLett.120.013901;
     pmid: 29350937


139. S. Longhi, Exceptional points and photonic catastrophe.
     Opt. Lett. 43 , 2929–2932 (2018). doi:10.1364/
     OL.43.002929; pmid: 29905726


140. E. Verhagen, A. Alù, Optomechanical nonreciprocity.
     Nat. Phys. 13 , 922–924 (2017). doi:10.1038/nphys4283
     141. T. Byrnes, N. Y. Kim, Y. Yamamoto, Exciton–polariton
     condensates.Nat. Phys. 10 , 803–813 (2014). doi:10.1038/
     nphys3143
     142. Y. Plotniket al., Experimental observation of optical bound
     states in the continuum.Phys. Rev. Lett. 107 ,183901
     (2011). doi:10.1103/PhysRevLett.107.183901;
     pmid: 22107630
     143. A. Kodigalaet al., Lasing action from photonic bound states
     in continuum.Nature 541 , 196–199 (2017). doi:10.1038/
     nature20799; pmid: 28079064
     144. H.M.Doeleman,F.Monticone,W.denHollander,
     A. Alù, A. F. Koenderink, Experimental observation
     of a polarization vortex at an optical bound state
     in the continuum.Nat. Photonics 12 ,397–401 (2018).
     doi:10.1038/s41566-018-0177-5
     145. A. Regensburgeret al., Observation of defect states in
     PT-symmetric optical lattices.Phys. Rev. Lett. 110 , 223902
     (2013). doi: 1 0.1103/PhysRevLett.110.223902;
     pmid: 23767725
     146. J. B. Khurgin, How to deal with the loss in plasmonics and
     metamaterials.Nat. Nanotechnol. 10 ,2–6 (2015).
     doi:10.1038/nnano.2014.310; pmid: 25559961

ACKNOWLEDGMENTS

Funding:This work was supported by the Office of Naval Research,

the Simons Foundation, the Air Force Office of Scientific

Research, and the National Science Foundation.Competing

interests:None declared.

10.1126/science.aar7709

Miriet al.,Science 363 , eaar7709 (2019) 4 January 2019 11 of 11

RESEARCH | REVIEW

on January 7, 2019^

http://science.sciencemag.org/

Downloaded from