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Advanced Nanophotonics Resonator Designs for High-Performance Surface-Enhanced Vibrational Spectroscopy Sensing Applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Advanced Nanophotonics Resonator Designs for High-Performance Surface-Enhanced Vibrational Spectroscopy Sensing Applications./
作者:	Miao, Xianglong.
面頁冊數:	1 online resource (202 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-08, Section: B.
Contained By:	Dissertations Abstracts International84-08B.
標題:	Optics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29394947click for full text (PQDT)
ISBN:	9798371977991

Advanced Nanophotonics Resonator Designs for High-Performance Surface-Enhanced Vibrational Spectroscopy Sensing Applications.
Miao, Xianglong.

Advanced Nanophotonics Resonator Designs for High-Performance Surface-Enhanced Vibrational Spectroscopy Sensing Applications. - 1 online resource (202 pages)

Source: Dissertations Abstracts International, Volume: 84-08, Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2023.

Includes bibliographical references

Infrared spectroscopy and Raman spectroscopy are widely used for the non- destructive, label-free detection and identification of the analyte sample in re- search institutions as well as the industry since they can provide the optical molecular vibration spectrum which contains the molecular composition and bond information. However, due to the weak interaction of light and ana- lyte molecules, it is still challenging to detect analytes with a low amount of molecules or ultrathin analyte film hence these tools are usually applied for solid material as well as liquid samples. Surface plasmons, supported by the photonics nanostructures, can significantly enhance the electromagnetic field near the metal surface of the nanostructure and hence boost the interaction of the light and analyte molecules, which will significantly increase the infrared absorption and the Raman scattering (the so-called surface enhanced infrared absorption (SEIRA) and the surface enhanced Raman spectroscopy (SERS), re- spectively). To increase the enhancement factors (EFs) of SEIRA and SERS, a variety of photonics nanostructures, which usually include nanometric gaps with confined and enhanced optical fields (i.e. the hot spots), are demonstrated. However, the nanostructures with nanometric gaps always have higher fabri- cation costs and the problems of efficiently delivering the analyte molecules in, which limit the surface enhanced technology used in the sensing applications.The goal of this thesis is to rationally design an enhanced nanophotonic nanostructure to overcome the restrictions and provide high-performance SEIRA and SERS sensors for a wide range of biochemical sensing applications. The hybrid structures of graphene antidots and gold cores separated with uniform nanometric gaps are exploited for higher electric field enhancement as well as the extinction response. The controllable gaps around 50nm to 120nm be- tween graphene edge and gold core can be realized with the proposed self- aligned lithography method without significantly increasing the fabrication cost and can achieve almost 3 times stronger extinction response and one order of magnitude electric field enhancement. The nanophotonic SEIRA sensors are demonstrated not only with large-field enhancement confined in the hot spot but also with the functionality of concentrating and trapping analyte molecules in the hot spots as the solution evaporates, hence leading to significantly im- proved SEIRA sensing performance. Thanks to the high enhancement in the hot spot and combing the proposed concentrating and trapping procedure, the designed SEIRA sensor can derive the vibrational information from target ana- lyte molecules L-proline and D-glucose with a mass down to picogram level. By utilizing the liquid gallium to play as the metal ground plane and to sandwich ultrathin analyte film into the nanometric gaps, the nanopatch antenna based high-performance SEIRA sensors are demonstrated. The formation of nano- metric gaps can realize exceedingly significant field enhancement and avoid the limitation of delivery of analytes into the hot spots without affecting the properties of the analytes, leading to high-performance SEIRA sensing of nano- metric analyte films. By utilizing the liquid gallium, the SERS sensors based on cost-effective RTA annealing produced gold nanoparticle substrate are also demonstrated with one order of magnitude of Raman signal enhancement and the improvement of signal spatial uniformity.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798371977991Subjects--Topical Terms:

517925
Optics.
Subjects--Index Terms:

Liquid metalIndex Terms--Genre/Form:

542853
Electronic books.

Advanced Nanophotonics Resonator Designs for High-Performance Surface-Enhanced Vibrational Spectroscopy Sensing Applications.
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520 $a Infrared spectroscopy and Raman spectroscopy are widely used for the non- destructive, label-free detection and identification of the analyte sample in re- search institutions as well as the industry since they can provide the optical molecular vibration spectrum which contains the molecular composition and bond information. However, due to the weak interaction of light and ana- lyte molecules, it is still challenging to detect analytes with a low amount of molecules or ultrathin analyte film hence these tools are usually applied for solid material as well as liquid samples. Surface plasmons, supported by the photonics nanostructures, can significantly enhance the electromagnetic field near the metal surface of the nanostructure and hence boost the interaction of the light and analyte molecules, which will significantly increase the infrared absorption and the Raman scattering (the so-called surface enhanced infrared absorption (SEIRA) and the surface enhanced Raman spectroscopy (SERS), re- spectively). To increase the enhancement factors (EFs) of SEIRA and SERS, a variety of photonics nanostructures, which usually include nanometric gaps with confined and enhanced optical fields (i.e. the hot spots), are demonstrated. However, the nanostructures with nanometric gaps always have higher fabri- cation costs and the problems of efficiently delivering the analyte molecules in, which limit the surface enhanced technology used in the sensing applications.The goal of this thesis is to rationally design an enhanced nanophotonic nanostructure to overcome the restrictions and provide high-performance SEIRA and SERS sensors for a wide range of biochemical sensing applications. The hybrid structures of graphene antidots and gold cores separated with uniform nanometric gaps are exploited for higher electric field enhancement as well as the extinction response. The controllable gaps around 50nm to 120nm be- tween graphene edge and gold core can be realized with the proposed self- aligned lithography method without significantly increasing the fabrication cost and can achieve almost 3 times stronger extinction response and one order of magnitude electric field enhancement. The nanophotonic SEIRA sensors are demonstrated not only with large-field enhancement confined in the hot spot but also with the functionality of concentrating and trapping analyte molecules in the hot spots as the solution evaporates, hence leading to significantly im- proved SEIRA sensing performance. Thanks to the high enhancement in the hot spot and combing the proposed concentrating and trapping procedure, the designed SEIRA sensor can derive the vibrational information from target ana- lyte molecules L-proline and D-glucose with a mass down to picogram level. By utilizing the liquid gallium to play as the metal ground plane and to sandwich ultrathin analyte film into the nanometric gaps, the nanopatch antenna based high-performance SEIRA sensors are demonstrated. The formation of nano- metric gaps can realize exceedingly significant field enhancement and avoid the limitation of delivery of analytes into the hot spots without affecting the properties of the analytes, leading to high-performance SEIRA sensing of nano- metric analyte films. By utilizing the liquid gallium, the SERS sensors based on cost-effective RTA annealing produced gold nanoparticle substrate are also demonstrated with one order of magnitude of Raman signal enhancement and the improvement of signal spatial uniformity.
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