2020 Fiscal Year Annual Research Report
長距離伝搬Bloch表面波導波路用いた高スループットセンシングの研究
| Project/Area Number |
20J13244
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| Research Institution | The University of Tokyo |
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Principal Investigator |
DENG CHIH ZONG 東京大学, 工学系研究科, 特別研究員(DC2)
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| Project Period (FY) |
2020-04-24 – 2022-03-31
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| Keywords | Bloch surface wave / biosensor |
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| Outline of Annual Research Achievements |
1)The surface wave platform based on Bloch surface wave was extended to infrared wavelengths including the fingerprint region of organic materials and the telecommunication wavelengths.
2)A surface wave circuit realizing light steering was designed, fabricated and evaluated. Left and right circularly polarized light is used to control the propagation of the light. The proposed the chiral metasurface realizing light steering is metal free and works at telecommunication wavelengths. These results were published in ACS Photonics.
3)The surface wave platform was applied to biosensing. A guiding slab-based optical biosensor is being investigated has been design with the high sensitivity that can the light transmittance in the output increase 132% with 40 nm biolayer coating. The preliminary experimental results show that the concept of Bloch surface wave guiding slab-based optical biosensor could be applied to detection of thin layer of biomaterials.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
1) Realization of the BSW guiding slab-based optical biosensor
Using far field and near field electromagnetic simulation to design, and optimize the dimensions of the BSW guiding slab-based optical biosensor. The BSW guiding slab for low-loss and long-propagation-length is realized with optimized geometry design. The light transmittance in the output is increased with the increase of the thickness of the biolayer. The transmittance in the output is increased with the increased of thickness of biolayer in the sensing area (gap between left- and right-side guiding slab). The light transmittance is increased 132% with 40 nm biolayer coating.
2)Experimental demonstration of the sensing performance of BSW guiding slab-based optical biosensor
The sensing ability to the biomarkers on the BSW platform surface is demonstrated with the bovine serum albumin (BSA) biolayer coating. APTES is used as the surface modification layer to enable the surface bind with the BSA molecule. The light intensity of out-couple light is increased with the BSA biolayer coating.
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| Strategy for Future Research Activity |
1) Assembly of spatial filtering system
In order to evaluate the property of monitoring a large number of sensing areas on a chip, a spatial filtering system with a NIR camera or lens-fiber-coupled photodetector will be built.
2) Design and evaluation of the guided-BSW based optical circuit for high throughput biosensor
The guided-BSW sensor is experimentally demonstrated with the gap as sensing area in between two guiding slabs, but the high throughput sensing with multiple sensing area has not realized yet. The high-throughput sensing will be realized by monitoring cascade sensing areas on-chip
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