Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique
Nonlinear nanoplasmonics is a largely unexplored research area that paves the way for many exciting applications, such as nanolasers, nanoantennas, and nanomodulators. In the field of nonlinear nanoplasmonics, it is highly desirable to characterize the nonlinearity of the optical absorption and scat...
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2019-11-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.10.211 |
| _version_ | 1811307899452915712 |
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| author | Tushar C. Jagadale Dhanya S. Murali Shi-Wei Chu |
| author_facet | Tushar C. Jagadale Dhanya S. Murali Shi-Wei Chu |
| author_sort | Tushar C. Jagadale |
| collection | DOAJ |
| description | Nonlinear nanoplasmonics is a largely unexplored research area that paves the way for many exciting applications, such as nanolasers, nanoantennas, and nanomodulators. In the field of nonlinear nanoplasmonics, it is highly desirable to characterize the nonlinearity of the optical absorption and scattering of single nanostructures. Currently, the common method to quantify optical nonlinearity is the z-scan technique, which yields real and imaginary parts of the permittivity by moving a thin sample with a laser beam. However, z-scan typically works with thin films, and thus acquires nonlinear responses from ensembles of nanostructures, not from single ones. In this work, we present an x-scan technique that is based on a confocal laser scanning microscope equipped with forward and backward detectors. The two-channel detection offers the simultaneous quantification for the nonlinear behavior of scattering, absorption and total attenuation by a single nanostructure. At low excitation intensities, both scattering and absorption responses are linear, thus confirming the linearity of the detection system. At high excitation intensities, we found that the nonlinear response can be derived directly from the point spread function of the x-scan images. Exceptionally large nonlinearities of both scattering and absorption are unraveled simultaneously for the first time. The present study not only provides a novel method for characterizing nonlinearity of a single nanostructure, but also reports surprisingly large plasmonic nonlinearities. |
| first_indexed | 2024-04-13T09:13:42Z |
| format | Article |
| id | doaj.art-9fdcf359a1694176a34628bca3fe0eff |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-04-13T09:13:42Z |
| publishDate | 2019-11-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-9fdcf359a1694176a34628bca3fe0eff2022-12-22T02:52:49ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862019-11-011012182219110.3762/bjnano.10.2112190-4286-10-211Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan techniqueTushar C. Jagadale0Dhanya S. Murali1Shi-Wei Chu2Department of Physics, National Taiwan University, No.1, Sec. 4, Roosevelt Rd., Taipei 10617, TaiwanDepartment of Physics, National Taiwan University, No.1, Sec. 4, Roosevelt Rd., Taipei 10617, TaiwanDepartment of Physics, National Taiwan University, No.1, Sec. 4, Roosevelt Rd., Taipei 10617, TaiwanNonlinear nanoplasmonics is a largely unexplored research area that paves the way for many exciting applications, such as nanolasers, nanoantennas, and nanomodulators. In the field of nonlinear nanoplasmonics, it is highly desirable to characterize the nonlinearity of the optical absorption and scattering of single nanostructures. Currently, the common method to quantify optical nonlinearity is the z-scan technique, which yields real and imaginary parts of the permittivity by moving a thin sample with a laser beam. However, z-scan typically works with thin films, and thus acquires nonlinear responses from ensembles of nanostructures, not from single ones. In this work, we present an x-scan technique that is based on a confocal laser scanning microscope equipped with forward and backward detectors. The two-channel detection offers the simultaneous quantification for the nonlinear behavior of scattering, absorption and total attenuation by a single nanostructure. At low excitation intensities, both scattering and absorption responses are linear, thus confirming the linearity of the detection system. At high excitation intensities, we found that the nonlinear response can be derived directly from the point spread function of the x-scan images. Exceptionally large nonlinearities of both scattering and absorption are unraveled simultaneously for the first time. The present study not only provides a novel method for characterizing nonlinearity of a single nanostructure, but also reports surprisingly large plasmonic nonlinearities.https://doi.org/10.3762/bjnano.10.211absorption cross sectionlaser scanning microscopynanoplasmonicsnonlinear absorptionnonlinear scatteringsingle gold nanostructures |
| spellingShingle | Tushar C. Jagadale Dhanya S. Murali Shi-Wei Chu Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique Beilstein Journal of Nanotechnology absorption cross section laser scanning microscopy nanoplasmonics nonlinear absorption nonlinear scattering single gold nanostructures |
| title | Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique |
| title_full | Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique |
| title_fullStr | Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique |
| title_full_unstemmed | Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique |
| title_short | Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique |
| title_sort | nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x scan technique |
| topic | absorption cross section laser scanning microscopy nanoplasmonics nonlinear absorption nonlinear scattering single gold nanostructures |
| url | https://doi.org/10.3762/bjnano.10.211 |
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