Reciprocal topological photonic crystals allow backscattering

Topological photonics has promised new devices that are resistant to backscattering, leading to lower loss, greater nonlinearity, and smaller footprint. New research shows that in reciprocal

photonic crystals, backscattering is unavoidable, implying that breaking reciprocity is essential to leveraging photonic Chern insulators. Access through your institution Buy or subscribe

This is a preview of subscription content, access via your institution ACCESS OPTIONS Access through your institution Access Nature and 54 other Nature Portfolio journals Get Nature+, our

best-value online-access subscription $32.99 / 30 days cancel any time Learn more Subscribe to this journal Receive 12 print issues and online access $209.00 per year only $17.42 per issue

Learn more Buy this article * Purchase on SpringerLink * Instant access to full article PDF Buy now Prices may be subject to local taxes which are calculated during checkout ADDITIONAL

ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support REFERENCES * Haldane, F. D. M. _Phys. Rev. Lett._ 61, 2015–2018 (1988). Article

  ADS  MathSciNet  Google Scholar  * Haldane, F. D. M. & Raghu, S. _Phys. Rev. Lett._ 100, 013904 (2008). Article  ADS  Google Scholar  * Wang, Z., Chong, Y., Joannopoulos, J. D. &

Soljacic, M. _Nature_ 461, 772–775 (2009). Article  ADS  Google Scholar  * Chang, C.-Z. et al. _Science_ 340, 167–170 (2013). Article  ADS  Google Scholar  * von Klitzing, K. _Phys. Rev.

Lett._ 122, 200001 (2019). Article  Google Scholar  * Hafezi, M., Demler, E. A., Lukin, M. D. & Taylor, J. M. _Nat. Phys._ 7, 907–912 (2011). Article  Google Scholar  * Bandres, M. A. et

al. _Science_ 359, eaar4005 (2018). Article  Google Scholar  * Guglielmon, J. & Rechtsman, M. C. _Phys. Rev. Lett._ 122, 153904 (2019). Article  ADS  Google Scholar  * Rosiek, C. A. et

al. _Nat. Photon._ https://doi.org/10.1038/s41566-023-01189-x (2023). Article  Google Scholar  * Mak, K. F., McGill, K. L., Park, J. & McEuen, P. L. _Science_ 344, 1489–1492 (2014).

Article  ADS  Google Scholar  * Cheng, X. et al. _Nat. Mater._ 15, 542–548 (2016). Article  ADS  Google Scholar  * Rechtsman, M. C. et al. _Nature_ 496, 196–200 (2013). Article  ADS  Google

Scholar  * Hafezi, M., Mittal, S., Fan, J., Migdall, A. & Taylor, J. M. _Nat. Photon._ 7, 1001–1005 (2013). Article  ADS  Google Scholar  * Bahari, B. et al. _Science_ 358, 636–640

(2017). Article  ADS  Google Scholar  * He, L. et al. _Nat. Commun._ 10, 4194 (2019). Article  ADS  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Physics

Department, The Pennsylvania State University, University Park, PA, USA Mikael C. Rechtsman Authors * Mikael C. Rechtsman View author publications You can also search for this author

inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to Mikael C. Rechtsman. ETHICS DECLARATIONS COMPETING INTERESTS The author declares no competing interests. RIGHTS AND PERMISSIONS

Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Rechtsman, M.C. Reciprocal topological photonic crystals allow backscattering. _Nat. Photon._ 17, 383–384 (2023).

https://doi.org/10.1038/s41566-023-01199-9 Download citation * Published: 05 May 2023 * Issue Date: May 2023 * DOI: https://doi.org/10.1038/s41566-023-01199-9 SHARE THIS ARTICLE Anyone you

share the following link with will be able to read this content: Get shareable link Sorry, a shareable link is not currently available for this article. Copy to clipboard Provided by the

Springer Nature SharedIt content-sharing initiative