Dissimilar directional couplers showing -symmetric-like behavior
Despite the benefits which the directional couplers based on parity-time symmetric systems may offer to the field of integrated optics, the realization of such couplers relies on rather strict design constraints on the waveguide parameters. Here, we analytically and numerically investigate direction...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2017-01-01
|
| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/aa7092 |
| _version_ | 1797750600649146368 |
|---|---|
| author | Wiktor Walasik Chicheng Ma Natalia M Litchinitser |
| author_facet | Wiktor Walasik Chicheng Ma Natalia M Litchinitser |
| author_sort | Wiktor Walasik |
| collection | DOAJ |
| description | Despite the benefits which the directional couplers based on parity-time symmetric systems may offer to the field of integrated optics, the realization of such couplers relies on rather strict design constraints on the waveguide parameters. Here, we analytically and numerically investigate directional couplers built of dissimilar waveguides that do not fulfill the parity-time symmetry. Nevertheless, we demonstrate that for properly designed parameters, at least one mode of such couplers shows a behavior similar to the one observed in parity-time symmetric systems. We find an analytical condition relating the gain and loss that enables such a behavior. Moreover, if the individual waveguides composing the dissimilar coupler are designed such that the propagation constants of their modes are identical, the behavior of both super-modes supported by the coupler resembles that of the parity-time symmetric systems. |
| first_indexed | 2024-03-12T16:36:08Z |
| format | Article |
| id | doaj.art-1b330e0e8eca466d9b86fae32b3e964e |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:36:08Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-1b330e0e8eca466d9b86fae32b3e964e2023-08-08T14:52:20ZengIOP PublishingNew Journal of Physics1367-26302017-01-0119707500210.1088/1367-2630/aa7092Dissimilar directional couplers showing -symmetric-like behaviorWiktor Walasik0https://orcid.org/0000-0002-1294-8902Chicheng Ma1Natalia M Litchinitser2Department of Electrical Engineering, University at Buffalo , The State University of New York, Buffalo, NY 14260, United States of AmericaDepartment of Electrical Engineering, University at Buffalo , The State University of New York, Buffalo, NY 14260, United States of AmericaDepartment of Electrical Engineering, University at Buffalo , The State University of New York, Buffalo, NY 14260, United States of AmericaDespite the benefits which the directional couplers based on parity-time symmetric systems may offer to the field of integrated optics, the realization of such couplers relies on rather strict design constraints on the waveguide parameters. Here, we analytically and numerically investigate directional couplers built of dissimilar waveguides that do not fulfill the parity-time symmetry. Nevertheless, we demonstrate that for properly designed parameters, at least one mode of such couplers shows a behavior similar to the one observed in parity-time symmetric systems. We find an analytical condition relating the gain and loss that enables such a behavior. Moreover, if the individual waveguides composing the dissimilar coupler are designed such that the propagation constants of their modes are identical, the behavior of both super-modes supported by the coupler resembles that of the parity-time symmetric systems.https://doi.org/10.1088/1367-2630/aa7092waveguidescouplersand arrayswave propagationtransmission and absorptioncharge conjugation |
| spellingShingle | Wiktor Walasik Chicheng Ma Natalia M Litchinitser Dissimilar directional couplers showing -symmetric-like behavior New Journal of Physics waveguides couplers and arrays wave propagation transmission and absorption charge conjugation |
| title | Dissimilar directional couplers showing -symmetric-like behavior |
| title_full | Dissimilar directional couplers showing -symmetric-like behavior |
| title_fullStr | Dissimilar directional couplers showing -symmetric-like behavior |
| title_full_unstemmed | Dissimilar directional couplers showing -symmetric-like behavior |
| title_short | Dissimilar directional couplers showing -symmetric-like behavior |
| title_sort | dissimilar directional couplers showing symmetric like behavior |
| topic | waveguides couplers and arrays wave propagation transmission and absorption charge conjugation |
| url | https://doi.org/10.1088/1367-2630/aa7092 |
| work_keys_str_mv | AT wiktorwalasik dissimilardirectionalcouplersshowingsymmetriclikebehavior AT chichengma dissimilardirectionalcouplersshowingsymmetriclikebehavior AT nataliamlitchinitser dissimilardirectionalcouplersshowingsymmetriclikebehavior |