Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector
Bound states in the continuum (BICs) are observed in optical cavities composed of a high refractive index periodic structure embedded in significantly lower refractive index surroundings, enabling vertical confinement of the grating modes. Here, we propose a vertically nonsymmetric configuration, im...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2021-11-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2021-0478 |
| _version_ | 1797947978572365824 |
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| author | Pruszyńska-Karbownik Emilia Janczak Mikołaj Czyszanowski Tomasz |
| author_facet | Pruszyńska-Karbownik Emilia Janczak Mikołaj Czyszanowski Tomasz |
| author_sort | Pruszyńska-Karbownik Emilia |
| collection | DOAJ |
| description | Bound states in the continuum (BICs) are observed in optical cavities composed of a high refractive index periodic structure embedded in significantly lower refractive index surroundings, enabling vertical confinement of the grating modes. Here, we propose a vertically nonsymmetric configuration, implemented on a high refractive index bulk substrate with a one-dimensional grating positioned on a distributed Bragg reflector (DBR). In this configuration, the grating modes are leaky, which could prohibit the creation of a BIC if the grating was implemented on uniform substrate. However, the judiciously designed DBR on which the grating is implemented reflects nonzero diffraction orders induced by the grating. We found that the laterally antisymmetric optical modes located at the center of the Brillouin zone of this structure create BICs that are robust against changes in the grating parameters, as long as the DBR reflects the diffraction orders. The configuration enables a high degree of design freedom, facilitating the realization of very high quality factor cavities in conventional all-semiconductor technology. |
| first_indexed | 2024-04-10T21:35:12Z |
| format | Article |
| id | doaj.art-ad774e821d0f4b07900f03e45e8440cb |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-04-10T21:35:12Z |
| publishDate | 2021-11-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-ad774e821d0f4b07900f03e45e8440cb2023-01-19T12:46:58ZengDe GruyterNanophotonics2192-86142021-11-01111455210.1515/nanoph-2021-0478Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflectorPruszyńska-Karbownik Emilia0Janczak Mikołaj1Czyszanowski Tomasz2Institute of Physics, Lodz University of Technology, ul. Wólczańska 217/221, 93-005, Łódź, PolandInstitute of Physics, Lodz University of Technology, ul. Wólczańska 217/221, 93-005, Łódź, PolandInstitute of Physics, Lodz University of Technology, ul. Wólczańska 217/221, 93-005, Łódź, PolandBound states in the continuum (BICs) are observed in optical cavities composed of a high refractive index periodic structure embedded in significantly lower refractive index surroundings, enabling vertical confinement of the grating modes. Here, we propose a vertically nonsymmetric configuration, implemented on a high refractive index bulk substrate with a one-dimensional grating positioned on a distributed Bragg reflector (DBR). In this configuration, the grating modes are leaky, which could prohibit the creation of a BIC if the grating was implemented on uniform substrate. However, the judiciously designed DBR on which the grating is implemented reflects nonzero diffraction orders induced by the grating. We found that the laterally antisymmetric optical modes located at the center of the Brillouin zone of this structure create BICs that are robust against changes in the grating parameters, as long as the DBR reflects the diffraction orders. The configuration enables a high degree of design freedom, facilitating the realization of very high quality factor cavities in conventional all-semiconductor technology.https://doi.org/10.1515/nanoph-2021-0478bound states in the continuumdistributed bragg reflectorone dimensional gratingsemiconductor microcavity |
| spellingShingle | Pruszyńska-Karbownik Emilia Janczak Mikołaj Czyszanowski Tomasz Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector Nanophotonics bound states in the continuum distributed bragg reflector one dimensional grating semiconductor microcavity |
| title | Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector |
| title_full | Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector |
| title_fullStr | Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector |
| title_full_unstemmed | Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector |
| title_short | Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector |
| title_sort | extended bound states in the continuum in a one dimensional grating implemented on a distributed bragg reflector |
| topic | bound states in the continuum distributed bragg reflector one dimensional grating semiconductor microcavity |
| url | https://doi.org/10.1515/nanoph-2021-0478 |
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