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

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 

机构地区：[1]State Key Lab of Analytical Chemistry for Life Science,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [2]Hyperspectral Nano-Imaging Team,Korea Research Institute of Standards and Science,Daejeon 34113,South Korea [3]Institute of Materials Research and Engineering,Agency for Science,Technology and Research,Singapore 138634,Singapore [4]College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China

出　　处：《National Science Review》2024年第5期220-228,共9页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(22227806,22374074 and 22004069);the Excellent Research Program of Nanjing University(ZYJH004);the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT;2022R1C1C1008766);the Nano Material Technology Development Program(6232016M3A7B6908929);the Agency for Science,Technology and Research(A*STAR)under the Career Development Fund-Seed Projects(222D800038).

摘　　要：The photoinduced dipole force(PiDF)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 PiDF in the mid-IR region has not been experimentally demonstrated due to the coexistence of photoinduced thermal force(PiTF),typically one to two orders of magnitude higher than PiDF.In this study,we demonstrate that,with the assistance of surface phonon polaritons,the PiDF of c-quartz can be enhanced to surpass its PiTF,enabling a clear observation of PiDF spectra reflecting the properties of the real part of permittivity.Leveraging the detection of the PiDF 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 

分 类 号：Q78[生物学—分子生物学]