Photonic Topological Insulators - nanoHUB
Transcript of Photonic Topological Insulators - nanoHUB
![Page 1: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/1.jpg)
Photonic Topological Insulators
Shouyuan Huang, Ph.D. Student
Department of Mechanical Engineering and Birck Nanotechnology Center, Purdue University
![Page 2: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/2.jpg)
What is topological insulator? TKNN understanding
Hasan, Kane Rev Mod Phys 2010
![Page 3: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/3.jpg)
What is topological insulator?
• Quantum Spin Hall Effect/2-D Topological Insulator • Spin-orbit coupling • Berry Curvature
• Spin-momentum locking
• Back-scattering free
• Magnetic monopoles/Majorana Fermions
• Dissipationless electronics/fault-tolerant quantum computers
![Page 4: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/4.jpg)
Why photonic topological insulators
• Scientific interest: Bosonic analog
• Non-reflective / one-way waveguide
• Disorder-immune boundary states
Lu et al. nphys 2016
Patton, Industry Stategy Symposium, 2013
![Page 5: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/5.jpg)
Photonic QHE • 2-D Topological states w/ magnetic field.
Raghu, Haldane PRL 2008
Wang et. al. PRL 2008 Wang et. al. Nature 2009 (Soljacic group)
![Page 6: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/6.jpg)
Photonic QHE • 2-D Topological states w/ magnetic field.
• Control of Chern number
Skirlo et al PRL 2014 Skirlo et al PRL 2015 (Soljacic group)
![Page 7: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/7.jpg)
Pushing towards Optical Frequences
Khanikaev et al. nmat 2012 (Shvets group)
![Page 8: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/8.jpg)
Pushing towards Optical Frequences • Thinking 2: Floquet theory with pseudo-time
“photonic graphene”
Gu et al. PRL 2011 Mak et al. Science 2014
Plotnik nmat 2013
Electronic:
Photonic:
![Page 9: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/9.jpg)
Pushing towards Optical Frequences • Thinking 2: Floquet theory with pseudo-time
Rechtsman et al. Nature 2013 (Segev group)
![Page 10: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/10.jpg)
Pushing towards Optical Frequences • Thinking 2: Floquet theory with pseudo-time
![Page 11: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/11.jpg)
Pushing towards Optical Frequences • Thinking 2: Floquet theory with pseudo-time
“photonic graphene”
Gu et al. PRL 2011 Mak et al. Science 2014
Electronic:
Photonic:
Ma Shvets CLEO 2016 Pseudo-time design?
![Page 12: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/12.jpg)
3-D PTI: existence of Weyl point • 3-D version of Dirac point
Double-gyroid
“photonic ARPES” Lu et al. nphys 2013; Lu et al Science 2014. (Soljacic’s group)
Self-assembly?
![Page 13: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/13.jpg)
3-D PTI: existence of Weyl point • 3-D version of Dirac point
Lu et al. nphys 2016. (Soljacic’s group)
Symmetry protection
![Page 14: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/14.jpg)
3-D PTI: existence of Weyl point • 3-D version of Dirac point
Noh et al. nphys 2017.
Phase differ by ½ cycle
![Page 15: Photonic Topological Insulators - nanoHUB](https://reader031.fdocuments.in/reader031/viewer/2022013015/61d07a0663d4900ef82fe195/html5/thumbnails/15.jpg)
Conclusion • Potential applications:
• Defect-immune in nanophotonic system. • One-way waveguide/photonic fibers • Large-volume/area single-mode sensing/lasing • Platform for new science
• Possible future works: • Optical wavelength one-way waveguide • Easy-realizable space groups for Weyl point