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Surface-phonon-polariton-enhanced photoinduced dipole force for nanoscale infrared imaging

National Science Review 2024年第5期11卷 227-235页

作者： Jian Li junghoon jahng Xuezhi Ma Jing Liang Xue Zhang Qianhao Min Xiao-Liang Wang Shuangjun Chen Eun Seong Lee Xing-Hua Xia State Key Lab of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Hyperspectral Nano-Imaging Team Korea Research Institute of Standards and Science Institute of Materials Research and Engineering Agency for ScienceTechnology and Research College of Materials Science and Engineering Nanjing Tech University

The photoinduced dipole force(Pi DF) is an attractive force arising from the Coulombic interaction between the light-induced dipoles on the illuminated tip and the sample. It shows extreme sample-tip distance and refractive index dependence, which is promising for nanoscale infrared(IR) imaging of ultrathin samples. However, the existence of Pi DF in the mid-IR region has not been experimentally demonstrated due to the coexistence of photoinduced thermal force(Pi TF), typically one to two orders of magnitude higher than Pi DF. In this study, we demonstrate that, with the assistance of surface phonon polaritons, the Pi DF of c-quartz can be enhanced to surpass its Pi TF, enabling a clear observation of Pi DF spectra reflecting the properties of the real part of permittivity. Leveraging the detection of the Pi DF of phonon polaritonic substrate, we propose a strategy to enhance the sensitivity and contrast of photoinduced force responses in transmission images, facilitating the precise differentiation of the heterogeneous distribution of ultrathin samples.

关键词： surface phonon polariton photoinduced dipole force nanoscale infrared imaging ultrathin sample

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Substructure imaging of heterogeneous nanomaterials with enhanced refractive index contrast by using a functionalized tip in photoinduced force microscopy

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Light(Science & Applications) 2018年第1期7卷 322-330页

作者： junghoon jahng Heejae Yang Eun Seong Lee Center for Nanocharacterization Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea Department of Materials Engineering Advanced Fibrous Materials LaboratoryUniversity of British ColumbiaVancouverBC V6T 1Z4Canada

The opto-mechanical force response from light-illuminated nanoscale materials has been exploited in many tip-based imaging applications to characterize various heterogeneous *** a force can have two origins:thermal expansion and induced *** thermal expansion reflects the absorption of the material,which enables one to chemically characterize a material at the absorption *** induced dipole interaction reflects the local refractive indices of the material underneath the tip,which is useful to characterize a material in the spectral region where no absorption resonance occurs,as in the infrared(IR)-inactive ***,the dipole force is relatively small,and the contrast is rarely discernible for most organic materials and biomaterials,which only show a small difference in refractive indices for their *** this letter,we demonstrate that refractive index contrast can be greatly enhanced with the assistance of a functionalized *** the enhanced contrast,we can visualize the substructure of heterogeneous biomaterials,such as a polyacrylonitrile-nanocrystalline cellulose(PAN-NCC)*** substructural visualization,we address the issue of the tensile strength of PAN-NCC fibers fabricated by several different mixing *** understanding from the present study will open up a new opportunity to provide enhanced sensitivity for substructure mapping of nanobiomaterials,as well as local field mapping of photonic devices,such as surface polaritons on semiconductors,metals and van der Waals materials.

关键词： refractive biomaterials functional

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Antenna Enhanced Infrared Photoinduced Force Imaging in Aqueous Environment with Super-Resolution and Hypersensitivity

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CCS Chemistry 2022年第8期4卷 2738-2747页

作者： Jian Li Jie Pang Zhen-dong Yan junghoon jahng Jin Li William Morrison Jing Liang Qing-Ying Zhang Xing-Hua Xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023 College of Science Nanjing Forestry UniversityNanjing 210037 Center for Nanocharacterization Korea Research Institute of Standards and ScienceDaejeon 34113 Molecular Vista Inc. San JoseCA 95119

Tip-enhanced infrared(IR)spectra and imaging have been widely used in cutting-edge studies for the in-depth understanding of the composition,structure,and function of interfaces at the ***,molecular monolayer sensitivity has only been demonstrated at solid/gas *** an aqueous environment,reduced sensitivity limits the practical applications of tip-enhanced IR ***,we present an approach to hypersensitive nanoscale IR spectra and imaging in an aqueous environment with a combination of photoinduced force(PiF)microscopy and resonant antennas.

关键词： photoinduced force microscopy aqueous environment infrared nanospectroscopy near-field imaging antenna

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Characterizing and controlling infrared phonon anomaly of bilayer graphene in optical-electrical force nanoscopy

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Light(Science & Applications) 2023年第12期12卷 2700-2710页

作者： junghoon jahng Sunho Lee Seong-Gu Hong Chang Jun Lee Sergey G.Menabde Min Seok Jang Dong-Hyun Kim Jangyup Son Eun Seong Lee Hyperspectral Nano-imaging Team Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Department of Aerospace Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Multiscale Mechanical Properties Measurement Team Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea School of Mechanical Engineering Chonnam National UniversityGwangju 61186Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Functional Composite Materials Research Center Korea Institute of Science and TechnologyJeonbuk 55324Republic of Korea SKKU Advanced Institute of Nanotechnology Sungkyunkwan UniversitySuwon 16419Republic of Korea Division of Nano&Information Technology KIST SchoolUniversity of Science and TechnologySeoul 02792Republic of Korea

We,for the first time,report the nanoscopic imaging study of anomalous infrared(IR)phonon enhancement of bilayer graphene,originated from the charge imbalance between the top and bottom layers,resulting in the enhancement of E1u mode of bilayer graphene near 0.2 *** modified the multifrequency atomic force microscope platform to combine photo-induced force microscope with electrostatic/Kelvin probe force microscope constituting a novel hybrid nanoscale optical-electrical force imaging *** enables to observe a correlation between the IR response,doping level,and topographic information of the graphene *** the nanoscale spectroscopic image measurements,we demonstrate that the charge imbalance at the graphene interface can be controlled by chemical(doping effect via Redox mechanism)and mechanical(triboelectric effect by the doped cantilever)***,we can also diagnosis the subsurface cracks on the stacked few-layer graphene at nanoscale,by monitoring the strain-induced IR phonon *** approach provides new insights into the development of graphene-based electronic and photonic devices and their potential applications.

关键词： electrical force optical

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