Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Optical isolation in topological-edge-state photonic arrays

Not Accessible

Your library or personal account may give you access

Abstract

We introduce a new type of optical isolator based on breaking time reversal symmetry in dissipative finite Su–Schrieffer–Heeger (SSH) waveguide arrays that support topological edge states at one end of the structure. In the forward propagation direction, light is launched into the edge waveguide to excite the localized topological midgap state. As a result, most of the input optical power is transmitted to the output port. On the other hand, backward reflected light encounters a propagation constant mismatch in that same channel which shifts the otherwise midgap state into one of the bands and hence becomes delocalized over the whole array. We show that under these conditions, a judicious spatial distribution of the optical dissipation across the structure can produce an isolation ratio of 50dB. The required nonreciprocal phase shift is introduced by depositing a magnetic garnet film only on the edge waveguide and, thus, the required magnetic field can be generated by an integrated micromagnet. Similar concepts can also be applied to SSH arrays made from optical resonators.

© 2015 Optical Society of America

Full Article  |  PDF Article
More Like This
Realizing topological edge states in a silicon nitride microring-based photonic integrated circuit

Chenxuan Yin, Yujie Chen, Xiaohui Jiang, Yanfeng Zhang, Zengkai Shao, Pengfei Xu, and Siyuan Yu
Opt. Lett. 41(20) 4791-4794 (2016)

Rabi-like oscillation of photonic topological valley Hall edge states

Hua Zhong, Yaroslav V. Kartashov, Yiqi Zhang, Daohong Song, Yanpeng Zhang, Fuli Li, and Zhigang Chen
Opt. Lett. 44(13) 3342-3345 (2019)

On-chip optical isolation via unidirectional Bloch oscillations in a waveguide array

Pradeep Kumar and Miguel Levy
Opt. Lett. 37(18) 3762-3764 (2012)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics

Select as filters


Select Topics Cancel
© Copyright 2022 | Optica Publishing Group. All Rights Reserved