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A historical overview of nano-optics:From near-field optics to plasmonics

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Chinese Physics B 2024年第5期33卷 134-145页

作者：邓妙怡朱星 Department of History of Science Technology and MedicineAcademy for Advanced Interdisciplinary StudiesPeking UniversityBeijing 100871China School of Physics Peking UniversityBeijing 100871China

Nano-optics is an emergent research field in physics that appeared in the 1980s,which deals with light–matter optical interactions at the nanometer *** early studies of nano-optics,the main concern focus is to obtain higher optical resolution over the diffraction *** researches of near-field imaging and spectroscopy based on scanning near-field optical microscopy(SNOM)are *** exploration of improving SNOM probe for near-field detection leads to the emergence of surface *** the sense of resolution and wider application,there has been a significant transition from seeking higher resolution microscopy to plasmonic near-field modulations in the nano-optics community during the nano-optic ***,studies of nano-optics prefer the investigation of plasmonics in different material *** this article,the history of the development of near-field optics is briefly *** difficulties of conventional SNOM to achieve higher resolution are *** an alternative solution,surface plasmons have shown the advantages of higher resolution,wider application,and flexible nano-optical modulation for new *** typical studies in different periods are introduced and characteristics of nano-optics in each stage are *** this way,the evolution progress from near-field optics to plasmonics of nano-optics research is *** future development of nano-optics is discussed then.

关键词： nano-optics near-field optics surface plasmon plasmonic modulation

Large focal length planar focusing of Dyakonov polaritons in hyperbolic metamaterial

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Progress in Natural Science:Materials International 2024年第4期34卷 632-636页

作者： Xiaoyu Xiong Yihang Fan Weipeng Wang Yongzheng Wen Zhengjun Zhang Jingbo Sun Ji Zhou State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University

Achieving subwavelength optical focusing is of great importance in nanophotonics. However, achieving focusing with both a small focal spot size and a large focal length remains elusive so far. Here, a large focal length planar focusing device is presented, utilizing highly oriented Dyakonov polaritons in hyperbolic metamaterial with periodic silver rings as the excitation source. Experimental results show that by controlling the size of the excitation sources, the focal length can reach 6λ0（where λ0is the illumination wavelength）, and the focal spot size can be reduced to λ0/10. This method provides new prospects for planar polariton optical applications.

关键词： Subwavelength optical focusing Dyakonov polaritons In-plane hyperbolic metamaterials near-field optics

Supercritical angle Raman microscopy: a surfacesensitive nanoscale technique without field enhancement

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Light(Science & Applications) 2017年第1期6卷 482-489页

作者： Diana Serrano Stefan Seeger Department of Chemistry University of ZurichWintherthurerstrasse 190CH-8057 ZurichSwitzerland

Raman scattering microscopy is a versatile tool for label-free imaging and molecular fingerprint ***,we provide the first demonstration that the selective collection of scattered signals exceeding the critical angle for total internal reflection enables surface-confined spontaneous Raman investigations at nanometre *** high-axial selectivity leads to improved signal-to-background ratios,thus making this technique an excellent probe for surface-related molecular *** richness of the spectroscopic information obtained through the supercritical angle Raman(SAR)collection path was proven by comparing its output with that of a parallel far-field collection ***,we demonstrated that the proposed SAR technique is a versatile microscopy approach that can be used alone or in combination with amplified Raman modalities such as surfaceenhanced resonance Raman scattering.

关键词： near-field optics Raman scattering supercritical microscopy surface science

Principle, system, and applications of tip-enhanced Raman spectroscopy

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1335-1344页

作者： ZHANG MingQian WANG Rui WU XiaoBin WANG Jia State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing 100084 China

Raman spectroscopy is a powerful technique in chemical information characterization. However, this spectral method is sub- ject to two obstacles in nano-material detection. One is diffraction limited spatial resolution, and the other is its inherent small Raman cross section and weak signaling. To resolve these problems, a new approach has been developed, denoted as tip-enhanced Raman spectroscopy （TERS）. TERS is capable of high-resolution and high-sensitivity detection and demonstrat- ed to be a promising spectroscopic and micro-topographic method to characterize nano-materials and nanostructures. In this paper, the principle and experimental system of TERS are discussed. The latest application of TERS in molecule detection, bi- ological specimen identification, nanao-material characterization, and senti-conductor material determination with some spe- cific experimental examples are presented.

关键词： near-field optics Raman spectroscopy electromagnetic-field enhancement

Space-time description of transverse photons: near-field aspects

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1389-1393页

作者： KELLER O. Institute of Physics and Nanotechnology Aalborg University

A mean position state based on the gauge invariant transverse vector potential is used to convert single-photon states in Hilbert space to photon wave packets in direct space. The resulting photon wave-mechanical description leads to scalar products which relate to covariant integration on the light cone. A new correlation matrix displays the spatial localization problem for single photons in an explicit manner in space-time. The correlation matrix essentially is the projection of the time-ordered Feynman photon propagator onto the transverse photon subspace. The present photon wave-mechanical formalism is generalized to two-photon dynamics. In the diamagnetic limit the transverse photon becomes massive in its interaction with matter, and the correlation matrix for massivephoton interaction, which can be used in studies of evanescent-photon mediated couplings, is analyzed. On the basis of the present formalism the existence of a dynamical near-field Aharonov-Bohm effect is predicted.

关键词： one-photon wave mechanics near-field optics correlation matrix transverse photon mass

A virtual optical probe based on evanescent wave interference

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Chinese Physics B 2002年第10期11卷 1022-1027页

作者：孙利群王佳等 DepartmentofPrecisioninstruments StateKeyLaboratoryofPrecisionMeasurementTechnologyandInstrumentsTsinghuaUniversityBeijing100084China DepartmentofPrecisioninstruments StateKeyLaboratoryofPrecisionM

A virtual probe is a novel immaterial tip based on the near-field evanescent wave interference and small aperture diffraction, which can be used in near-field high-density optical data storage, nano-lithography, near-field optical imaging and spectral detection, near-field optical manipulation of nano-scale specimen, etc. In this paper, the formation mechanism of the virtual probe is analysed, the evanescent wave interference discussed theoretically, andthe sidelobe suppression by small aperture is simulated by the three-dimensional finite-difference time-domain method The simulation results of the optical distribution of the near-field virtual probe reveal that the transmission efficiencyof the virtual probe is 102-104 times higher than that of the nano-aperture metal-coated fibre probe widely used in near-field optical systems. The full width at half maximum of the peak, in other words, the size of virtual probe, is constant whatever the distance in a certain range so that the critical nano-separation control in the near-field system can be relaxed. We give an example of the application of the virtual probe in ultrahigh-density optical data storage.

关键词： near-field optics evanescent wave interference virtual probe finite-difference time domain method

Numerical Study of Surface Plasmons Nano-Optical Antenna and Its Array

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Journal of Semiconductors 2008年第12期29卷 2340-2345页

作者：郭宝山宋国锋陈良惠中国科学院半导体研究所北京100083 中国科学院研究生院北京100049

Nano-rod and bow-tie antennas that are gold nano-antennas on dielectric material and the nano-rod antenna arrays are numerically studied by the finite difference time domain method in three dimensions. The light field that project on the antennas can be confined to a spot with subwavelength width （-λ/11）,and the light intensity can be enhanced to 91 times the incident light in the near-field with the bow-tie antenna. The enhancement also exists in the antenna arrays. The highest enhancement of the light intensity at the bow-tie antenna gap can reach about 28000 times,and the localized field can be coupled to a nano-particle near the antenna gap.

关键词： near-field optics surface plasmons optical antenna