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用于技术和生物医学应用的激光控制电子流器件中等离子体金纳米星的光发射。

Photoemission of Plasmonic Gold Nanostars in Laser-Controlled Electron Current Devices for Technical and Biomedical Applications.

机构信息

Institute of Precision Mechanics and Control, FRC "Saratov Scientific Centre of the Russian Academy of Sciences", 410028 Saratov, Russia.

Science Medical Center, Saratov State University, 410012 Saratov, Russia.

出版信息

Sensors (Basel). 2022 May 29;22(11):4127. doi: 10.3390/s22114127.

DOI:10.3390/s22114127
PMID:35684746
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9185440/
Abstract

The main goal of this work was to modify the previously developed blade-type planar structure using plasmonic gold nanostars in order to stimulate photofield emission and provide efficient laser control of the electron current. Localization and enhancement of the field at the tips of gold nanostars provided a significant increase in the tunneling electron current in the experimental sample (both electrical field and photofield emission). Irradiation at a wavelength in the vicinity of the plasmon resonance (red laser) provided a gain in the photoresponse value of up to 5 times compared to irradiation far from the resonance (green laser). The prospects for transition to regimes of structure irradiation by femtosecond laser pulses at the wavelength of surface plasmon resonance, which lead to an increase in the local optical field, are discussed. The kinetics of the energy density of photoinduced hot and thermalized electrons is estimated. The proposed laser-controlled matrix current source is promising for use in X-ray computed tomography systems.

摘要

这项工作的主要目标是使用等离子体金纳米星对先前开发的叶片型平面结构进行修改，以便刺激光场发射并提供对电子电流的高效激光控制。金纳米星尖端的场的定位和增强提供了实验样品中隧穿电子电流的显著增加（电场和光场发射）。在等离子体共振附近的波长（红色激光）照射下，与远离共振的照射（绿色激光）相比，光响应值增加了 5 倍。讨论了通过表面等离子体共振波长的飞秒激光脉冲过渡到结构照射模式的前景，这会导致局部光场的增加。估计了光致热和热化电子的能量密度的动力学。所提出的激光控制的矩阵电流源有望用于 X 射线计算机断层扫描系统。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/9b22af2ca968/sensors-22-04127-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/3a82dd90ad9c/sensors-22-04127-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/fd0ae73899da/sensors-22-04127-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/4aeb8490a718/sensors-22-04127-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/b2c3e03c1055/sensors-22-04127-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/1195b198cf54/sensors-22-04127-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/5855fe7ec433/sensors-22-04127-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/7aaba7199a83/sensors-22-04127-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/5d3609b7c1c7/sensors-22-04127-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/c0be8fbdc41a/sensors-22-04127-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/f697e9c199bb/sensors-22-04127-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/eaa749b5cb33/sensors-22-04127-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/3bb9cf040a91/sensors-22-04127-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/9b22af2ca968/sensors-22-04127-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/3a82dd90ad9c/sensors-22-04127-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/fd0ae73899da/sensors-22-04127-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/4aeb8490a718/sensors-22-04127-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/b2c3e03c1055/sensors-22-04127-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/1195b198cf54/sensors-22-04127-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/5855fe7ec433/sensors-22-04127-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/7aaba7199a83/sensors-22-04127-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/5d3609b7c1c7/sensors-22-04127-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/c0be8fbdc41a/sensors-22-04127-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/f697e9c199bb/sensors-22-04127-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/eaa749b5cb33/sensors-22-04127-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/3bb9cf040a91/sensors-22-04127-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4ddc/9185440/9b22af2ca968/sensors-22-04127-g013.jpg

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