Asymmetric metasurface photodetectors for single-shot quantitative phase imaging
The visualization of pure phase objects by wavefront sensing has important applications ranging from surface profiling to biomedical microscopy, and generally requires bulky and complicated setups involving optical spatial filtering, interferometry, or structured illumination. Here we introduce a ne...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2023-08-01
|
| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2023-0354 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850159229230383104 |
|---|---|
| author | Liu Jianing Wang Hao Li Yuyu Tian Lei Paiella Roberto |
| author_facet | Liu Jianing Wang Hao Li Yuyu Tian Lei Paiella Roberto |
| author_sort | Liu Jianing |
| collection | DOAJ |
| description | The visualization of pure phase objects by wavefront sensing has important applications ranging from surface profiling to biomedical microscopy, and generally requires bulky and complicated setups involving optical spatial filtering, interferometry, or structured illumination. Here we introduce a new type of image sensors that are uniquely sensitive to the local direction of light propagation, based on standard photodetectors coated with a specially designed plasmonic metasurface that creates an asymmetric dependence of responsivity on angle of incidence around the surface normal. The metasurface design, fabrication, and angle-sensitive operation are demonstrated using a simple photoconductive detector platform. The measurement results, combined with computational imaging calculations, are then used to show that a standard camera or microscope based on these metasurface pixels can directly visualize phase objects without any additional optical elements, with state-of-the-art minimum detectable phase contrasts below 10 mrad. Furthermore, the combination of sensors with equal and opposite angular response on the same pixel array can be used to perform quantitative phase imaging in a single shot, with a customized reconstruction algorithm which is also developed in this work. By virtue of its system miniaturization and measurement simplicity, the phase imaging approach enabled by these devices is particularly significant for applications involving space-constrained and portable setups (such as point-of-care imaging and endoscopy) and measurements involving freely moving objects. |
| format | Article |
| id | doaj-art-a68c74cf55614e82be0d6bf204e73671 |
| institution | OA Journals |
| issn | 2192-8614 |
| language | English |
| publishDate | 2023-08-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-a68c74cf55614e82be0d6bf204e736712025-08-20T02:23:36ZengDe GruyterNanophotonics2192-86142023-08-0112173519352810.1515/nanoph-2023-0354Asymmetric metasurface photodetectors for single-shot quantitative phase imagingLiu Jianing0Wang Hao1Li Yuyu2Tian Lei3Paiella Roberto4Department of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary’s Street, Boston, MA02215, USADepartment of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary’s Street, Boston, MA02215, USADepartment of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary’s Street, Boston, MA02215, USADepartment of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary’s Street, Boston, MA02215, USADepartment of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary’s Street, Boston, MA02215, USAThe visualization of pure phase objects by wavefront sensing has important applications ranging from surface profiling to biomedical microscopy, and generally requires bulky and complicated setups involving optical spatial filtering, interferometry, or structured illumination. Here we introduce a new type of image sensors that are uniquely sensitive to the local direction of light propagation, based on standard photodetectors coated with a specially designed plasmonic metasurface that creates an asymmetric dependence of responsivity on angle of incidence around the surface normal. The metasurface design, fabrication, and angle-sensitive operation are demonstrated using a simple photoconductive detector platform. The measurement results, combined with computational imaging calculations, are then used to show that a standard camera or microscope based on these metasurface pixels can directly visualize phase objects without any additional optical elements, with state-of-the-art minimum detectable phase contrasts below 10 mrad. Furthermore, the combination of sensors with equal and opposite angular response on the same pixel array can be used to perform quantitative phase imaging in a single shot, with a customized reconstruction algorithm which is also developed in this work. By virtue of its system miniaturization and measurement simplicity, the phase imaging approach enabled by these devices is particularly significant for applications involving space-constrained and portable setups (such as point-of-care imaging and endoscopy) and measurements involving freely moving objects.https://doi.org/10.1515/nanoph-2023-0354computational imagingimage sensorsmetasurface flat opticsquantitative phase imagingwavefront sensing |
| spellingShingle | Liu Jianing Wang Hao Li Yuyu Tian Lei Paiella Roberto Asymmetric metasurface photodetectors for single-shot quantitative phase imaging Nanophotonics computational imaging image sensors metasurface flat optics quantitative phase imaging wavefront sensing |
| title | Asymmetric metasurface photodetectors for single-shot quantitative phase imaging |
| title_full | Asymmetric metasurface photodetectors for single-shot quantitative phase imaging |
| title_fullStr | Asymmetric metasurface photodetectors for single-shot quantitative phase imaging |
| title_full_unstemmed | Asymmetric metasurface photodetectors for single-shot quantitative phase imaging |
| title_short | Asymmetric metasurface photodetectors for single-shot quantitative phase imaging |
| title_sort | asymmetric metasurface photodetectors for single shot quantitative phase imaging |
| topic | computational imaging image sensors metasurface flat optics quantitative phase imaging wavefront sensing |
| url | https://doi.org/10.1515/nanoph-2023-0354 |
| work_keys_str_mv | AT liujianing asymmetricmetasurfacephotodetectorsforsingleshotquantitativephaseimaging AT wanghao asymmetricmetasurfacephotodetectorsforsingleshotquantitativephaseimaging AT liyuyu asymmetricmetasurfacephotodetectorsforsingleshotquantitativephaseimaging AT tianlei asymmetricmetasurfacephotodetectorsforsingleshotquantitativephaseimaging AT paiellaroberto asymmetricmetasurfacephotodetectorsforsingleshotquantitativephaseimaging |