Optical Fibers in Integrated Molecular Sensor Systems – More Than Interconnects

2012 ◽  
Vol 1438 ◽  
Author(s):  
Xuan Yang ◽  
Claire Gu
Keyword(s):  
Optical Fibers ◽  
Optical Power ◽  
Building Blocks ◽  
Optical Systems ◽  
Sensor Systems ◽  
Integrated Sensor ◽  
Molecular Sensors ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Enhanced Raman Scattering

ABSTRACTOptical fibers have been successfully used in long-haul communication, endoscopy, and other optical systems to transmit optical power as well as information from one point to another, serving as interconnects at various scales. In integrated sensor systems, optical fibers have been frequently employed to connect the source and the detector, due to their flexibility, compactness, and low loss. However, optical fibers can provide more functions than a simple transmission channel. In this paper, we review our work on optical fibers as a platform for molecular sensors based on Raman spectroscopy (RS) and surface enhanced Raman scattering (SERS). The fibers serve to significantly increase the sensitivity of RS/SERS and to facilitate the integration of a compact sensor system. We will discuss the principles of operation of various building blocks, demonstrate our recent results, and highlight some potential applications.

Metal–semiconductor heterostructures for surface-enhanced Raman scattering: synergistic contribution of plasmons and charge transfer

2021 ◽  
Author(s):  
Yawen Liu ◽  
Hao Ma ◽  
Xiao Xia Han ◽  
Bing Zhao
Keyword(s):  
Charge Transfer ◽  
Raman Scattering ◽  
Building Blocks ◽  
Surface Enhanced Raman Scattering ◽  
Semiconductor Heterostructures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

SERS on metal–semiconductor heterostructures including their building blocks, enhancement mechanisms and applications was reviewed. The synergistic contribution of plasmons and charge transfer is highlighted.

scholarly journals Manipulation and Applications of Hotspots in Nanostructured Surfaces and Thin Films

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1667 ◽  
Author(s):  
Xiaoyu Zhao ◽  
Jiahong Wen ◽  
Aonan Zhu ◽  
Mingyu Cheng ◽  
Qi Zhu ◽  
...  
Keyword(s):  
Thin Films ◽  
Physical Vapor Deposition ◽  
Molecular Spectroscopy ◽  
Deposition Process ◽  
Etching Time ◽  
Nanostructured Surfaces ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Enhanced Raman Scattering

The synthesis of nanostructured surfaces and thin films has potential applications in the field of plasmonics, including plasmon sensors, plasmon-enhanced molecular spectroscopy (PEMS), plasmon-mediated chemical reactions (PMCRs), and so on. In this article, we review various nanostructured surfaces and thin films obtained by the combination of nanosphere lithography (NSL) and physical vapor deposition. Plasmonic nanostructured surfaces and thin films can be fabricated by controlling the deposition process, etching time, transfer, fabrication routes, and their combination steps, which manipulate the formation, distribution, and evolution of hotspots. Based on these hotspots, PEMS and PMCRs can be achieved. This is especially significant for the early diagnosis of hepatocellular carcinoma (HCC) based on surface-enhanced Raman scattering (SERS) and controlling the growth locations of Ag nanoparticles (AgNPs) in nanostructured surfaces and thin films, which is expected to enhance the optical and sensing performance.

scholarly journals Surface-Enhanced Raman Scattering Activity of ZrO2 Nanoparticles: Effect of Tetragonal and Monoclinic Phases

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2162
Author(s):  
Mingyue Yi ◽  
Yu Zhang ◽  
Jiawen Xu ◽  
Dingyuan Deng ◽  
Zhu Mao ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Synthesis Method ◽  
Surface Enhanced Raman Scattering ◽  
Crystal Form ◽  
Transmission Efficiency ◽  
Zro2 Nanoparticles ◽  
Molecular Sensors ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The effect of the ZrO2 crystal form on surface-enhanced Raman scattering (SERS) activity was studied. The ratio of the tetragonal (T) and monoclinic (M) phases of ZrO2 nanoparticles (ZrO2 NPs) was controlled by regulating the ratio of two types of additives in the hydrothermal synthesis method. The SERS intensity of 4-mercaptobenzoic acid (4–MBA) was gradually enhanced by changing the M and T phase ratio in ZrO2 NPs. The degree of charge transfer (CT) in the enhanced 4–MBA molecule was greater than 0.5, indicating that CT was the main contributor to SERS. The intensity of SERS was strongest when the ratio of the T crystal phase in ZrO2 was 99.7%, and the enhancement factor reached 2.21 × 104. More importantly, the proposed study indicated that the T and M phases of the ZrO2 NPs affected the SERS enhancement. This study provides a new approach for developing high-quality SERS substrates and improving the transmission efficiency of molecular sensors.

Optical fibers for miniaturized surface-enhanced Raman-scattering probes

2013 ◽  
Vol 52 (34) ◽  
pp. 8388 ◽  
Author(s):  
Jennifer S. Hartley ◽  
Saulius Juodkazis ◽  
Paul R. Stoddart
Keyword(s):  
Raman Scattering ◽  
Optical Fibers ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

scholarly journals Discrepancies in the Microstructures of Annealed Cu–Zr Bulk Alloy and Cu–Zr Alloy Films

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2467 ◽  
Author(s):  
Haoliang Sun ◽  
Xiaoxue Huang ◽  
Xinxin Lian ◽  
Guangxin Wang
Keyword(s):  
Bulk Alloy ◽  
Alloy Films ◽  
Film Composite ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Enhanced Raman Scattering ◽  
Stress States ◽  
Bulk Alloys ◽  
Zr Alloy

Copper–zirconium bulk alloy and Cu–Zr alloy films are prepared by vacuum smelting and magnetron sputtering, respectively, and subsequently annealing is conducted. Results show that Cu–Zr bulk alloy and alloy films exhibit significantly different microstructure evolution behaviors after annealing due to different microstructures and residual stress states. CuxZr alloy compounds disperse at the grain boundary of Cu grains in as-cast and annealed Cu–Zr bulk alloys. However, unlike bulk alloys, a large number of polyhedral Cu particles are formed on the Cu–Zr thin films’ surface upon thermal annealing. Kinetically, the residual compressive stress in the Cu–Zr films promotes the formation of Cu particles. The influencing factors and the path for mass transport in the formation of the particles are discussed. The large-specific surface area particles/film composite structure has potential applications in Surface-Enhanced Raman Scattering, catalysis, and other fields.

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