Electro-optic detection of sub-wavelength THz spot sizes in the near-field of a metal tip

Author(s):  
N. C. J. van der Valk ◽  
W. Th. Wenckebach ◽  
P. C. M. Planken
2002 ◽  
Vol 81 (9) ◽  
pp. 1558-1560 ◽  
Author(s):  
N. C. J. van der Valk ◽  
P. C. M. Planken
Keyword(s):  

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Sonakshi Arora ◽  
Thomas Bauer ◽  
René Barczyk ◽  
Ewold Verhagen ◽  
L. Kuipers

AbstractTopological on-chip photonics based on tailored photonic crystals (PhCs) that emulate quantum valley-Hall effects has recently gained widespread interest owing to its promise of robust unidirectional transport of classical and quantum information. We present a direct quantitative evaluation of topological photonic edge eigenstates and their transport properties in the telecom wavelength range using phase-resolved near-field optical microscopy. Experimentally visualizing the detailed sub-wavelength structure of these modes propagating along the interface between two topologically non-trivial mirror-symmetric lattices allows us to map their dispersion relation and differentiate between the contributions of several higher-order Bloch harmonics. Selective probing of forward- and backward-propagating modes as defined by their phase velocities enables direct quantification of topological robustness. Studying near-field propagation in controlled defects allows us to extract upper limits of topological protection in on-chip photonic systems in comparison with conventional PhC waveguides. We find that protected edge states are two orders of magnitude more robust than modes of conventional PhC waveguides. This direct experimental quantification of topological robustness comprises a crucial step toward the application of topologically protected guiding in integrated photonics, allowing for unprecedented error-free photonic quantum networks.


1999 ◽  
Vol 5 (S2) ◽  
pp. 976-977
Author(s):  
M. Raval ◽  
D. Klenerman ◽  
T. Rayment ◽  
Y. Korchev ◽  
M. Lab

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.


Photonics ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 22 ◽  
Author(s):  
George Keiser ◽  
Pernille Klarskov

This article reviews recent advances in terahertz science and technology that rely on confining the energy of incident terahertz radiation to small, very sub-wavelength sized regions. We focus on two broad areas of application for such field confinement: metamaterial-based nonlinear terahertz devices and terahertz near-field microscopy and spectroscopy techniques. In particular, we focus on field confinement in: terahertz nonlinear absorbers, metamaterial enhanced nonlinear terahertz spectroscopy, and in sub-wavelength terahertz imaging systems.


Lab on a Chip ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 3714-3725 ◽  
Author(s):  
Kuan-Wen Tung ◽  
Pei-Shan Chung ◽  
Cong Wu ◽  
Tianxing Man ◽  
Sidhant Tiwari ◽  
...  

This manuscript demonstrates a near-field acoustic platform to synthesize high resolution, complex and non-periodic energy potential wells for patterning micro-objects.


Author(s):  
Shintaro Hisatake ◽  
Yusuke Tanaka ◽  
Cybelle Belem ◽  
Cyril Luxey ◽  
Frederic Gianesello ◽  
...  

2014 ◽  
Vol 62 (7) ◽  
pp. 3543-3556 ◽  
Author(s):  
Alon Ludwig ◽  
Costas D. Sarris ◽  
George V. Eleftheriades

2012 ◽  
Vol 20 (5) ◽  
pp. 5264 ◽  
Author(s):  
C.-C. Lee ◽  
S. Suzuki ◽  
W. Xie ◽  
T. R. Schibli
Keyword(s):  

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