Tunable nanoantennas with liquid crystals: dynamic wavefront control with sub-wavelength resolution

2021 ◽  
Author(s):  
Ramón J. Paniagua-Domínguez ◽  
Parikshit Moitra ◽  
Damien Eschimese ◽  
Rasna Maruthiyodan Veetil ◽  
Xuewu Xu ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Wavefront Control ◽  
Wavelength Resolution ◽  
Sub Wavelength

scholarly journals Sparsity-based continuous wave terahertz lens-free on-chip holography with sub-wavelength resolution

2019 ◽  
Vol 27 (2) ◽  
pp. 702 ◽  
Author(s):  
Zeyu Li ◽  
Qiang Yan ◽  
Yu Qin ◽  
Weipeng Kong ◽  
Guangbin Li ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Wavelength Resolution ◽  
On Chip ◽  
Sub Wavelength

Development of a Combined Scanning Ion-Conductance and Nearfield Optical Microscope to Image Living Cells

1999 ◽  
Vol 5 (S2) ◽  
pp. 976-977
Author(s):  
M. Raval ◽  
D. Klenerman ◽  
T. Rayment ◽  
Y. Korchev ◽  
M. Lab
Keyword(s):  
Optical Microscopy ◽  
Biological Samples ◽  
Near Field ◽  
Sample Surface ◽  
Optical Microscope ◽  
Ion Conductance ◽  
Simultaneous Generation ◽  
Simple Arrangement ◽  
Wavelength Resolution ◽  
Sub Wavelength

It is important to be able to image biological samples in a manner that is non-invasive and allows the sample to retain its functionality during imaging.A member of the SPM (scanning probe microscopy) family, SNOM (scanning near-field optical microscopy), has emerged as a technique that allows optical and topographic imaging of biological samples whilst satisfying the above stated criteria. The basic operating principle of SNOM is as follows. Light is coupled down a fibre-optic probe with an output aperture of sub-wavelength dimensions. The probe is then scanned over the sample surface from a distance that is approximately equal to the size of its aperture. By this apparently simple arrangement, the diffraction limit posed by conventional optical microscopy is overcome and simultaneous generation of optical and topographic images of sub-wavelength resolution is made possible. Spatial resolution values of lOOnm in air and 60nm in liquid[1,2] are achievable with SNOM.

Sub-wavelength resolution in linear arrays of plasmonic particles

2007 ◽  
Vol 101 (12) ◽  
pp. 123102 ◽  
Author(s):  
Constantin R. Simovski ◽  
Ari J. Viitanen ◽  
Sergei A. Tretyakov
Keyword(s):  
Linear Arrays ◽  
Wavelength Resolution ◽  
Sub Wavelength ◽  
Plasmonic Particles

scholarly journals Fourier optics approach to imaging with sub-wavelength resolution through metal-dielectric multilayers

2010 ◽  
Vol 18 (4) ◽  
Author(s):  
R. Kotyński
Keyword(s):  
Point Spread Function ◽  
Imaging System ◽  
Diffraction Theory ◽  
Spatial Filter ◽  
Fourier Optics ◽  
Point Spread ◽  
Spread Function ◽  
Point Spread Function Engineering ◽  
Wavelength Resolution ◽  
Sub Wavelength

AbstractMetal-dielectric layered stacks for imaging with sub-wavelength resolution are regarded as linear isoplanatic systems — a concept popular in Fourier optics and in scalar diffraction theory. In this context, a layered flat lens is a one-dimensional spatial filter characterised by the point spread function. However, depending on the model of the source, the definition of the point spread function for multilayers with sub-wavelength resolution may be formulated in several ways. Here, a distinction is made between a soft source and hard electric or magnetic sources. Each of these definitions leads to a different meaning of perfect imaging. It is shown that some simple interpretations of the PSF, such as the relation of its width to the resolution of the imaging system are ambiguous for the multilayers with sub-wavelenth resolution. These differences must be observed in point spread function engineering of layered systems with sub-wavelength sized PSF.

Study of Hot Spots Probing Based on Meta-Pillars Array

2019 ◽  
Vol 16 (9) ◽  
pp. 3692-3697
Author(s):  
Yisha You ◽  
Fujuan Huang ◽  
Yongqi Fu ◽  
Shaoli Zhu
Keyword(s):  
Hot Spots ◽  
Near Field ◽  
Optical Microscope ◽  
Microscopic Imaging ◽  
Secondary Sources ◽  
Imaging Application ◽  
Calculation Results ◽  
Wavelength Resolution ◽  
Near Field Scanning ◽  
Sub Wavelength

Inspired by imaging principle of near-field scanning optical microscope (NSOM), meta-pillars array is designed and analyzed on the basis of microscopic imaging application with high resolution. Finely focused spots acting as tiny secondary sources for illumination at near-field can be derived under supporting of the meta-pillars for the purpose of increasing imaging resolution. Numerical calculation is carried out on the basis of finite difference and time domain (FDTD) algorithm. Our calculation results demonstrate that the meta-pillars are capable of supporting the microscopic imaging at sub-wavelength resolution.

scholarly journals Metal-dielectric composites for beam splitting and far-field deep sub-wavelength resolution for visible wavelengths

2010 ◽  
Vol 18 (14) ◽  
pp. 14794 ◽  
Author(s):  
Changchun Yan ◽  
Dao Hua Zhang ◽  
Yuan Zhang ◽  
Dongdong Li ◽  
M. A. Fiddy
Keyword(s):  
Far Field ◽  
Beam Splitting ◽  
Wavelength Resolution ◽  
Visible Wavelengths ◽  
Sub Wavelength
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