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Directivity-Enhanced Detection of a Single Nanoparticle Using a Plasmonic Slot Antenna.
Wu, Bei; Lou, Yuanhao; Wu, Dan; Min, Qiuhong; Wan, Xinchen; Zhang, Hongyuan; Yu, Yarong; Ma, Jian; Si, Gangzheng; Pang, Yuanjie.
Affiliation
  • Wu B; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Lou Y; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Wu D; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Min Q; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Wan X; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Zhang H; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Yu Y; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Ma J; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Si G; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
  • Pang Y; School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, Hubei 430074, China.
Nano Lett ; 22(6): 2374-2380, 2022 03 23.
Article in En | MEDLINE | ID: mdl-35285643
In situ refractive index sensors integrated with nanoaperture-based optical tweezers possess stable and sensitive responsivity to single nanoparticles. In most existing works, detection events are only identified using the total light intensity with directivity information ignored, leading to a low signal-to-noise ratio. Here, we propose to detect an optically trapped 20 nm silica particle by monitoring directivity of a plasmonic antenna. The main and secondary radiation lobes of the antenna reverse upon trapping because the particle-induced perturbation negates the relative phase between two antenna elements, leading to a significant change of the antenna front-to-back ratio. As a result, we obtain a signal-to-noise ratio of 20, with an order-of-magnitude improvement as compared to the intensity-only detection scheme.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Refractometry / Nanoparticles Type of study: Diagnostic_studies Language: En Journal: Nano Lett Year: 2022 Document type: Article Affiliation country: Country of publication:

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Refractometry / Nanoparticles Type of study: Diagnostic_studies Language: En Journal: Nano Lett Year: 2022 Document type: Article Affiliation country: Country of publication: