Optical antenna assisted near infrared photodetection: Multilayer SOI stack for enhanced near-field coupling

With diameters close to the wavelength of the guided light, optical microfibers (MFs) can guide light with tight optical confinement, strong evanescent fields and manageable waveguide dispersion and have been widely investigated in the past decades for a variety of applications. Compared to silica MFs, which are ideal for working in visible and near-infrared regions, chalcogenide glass (ChG) MFs are promising for mid-infrared (mid-IR) optics, owing to their easy fabrication, broad-band transparency and high nonlinearity, and have been attracting increasing attention in applications ranging from near-field coupling and molecular sensing to nonlinear optics. Here, we review this emerging field, mainly based on its progress in the last decade. Starting from the high-temperature taper drawing technique for MF fabrication, we introduce basic mid-IR waveguiding properties of typical ChG MFs made of As2S3 and As2Se3. Then, we focus on ChG-MF-based passive optical devices, including optical couplers, resonators and gratings and active and nonlinear applications of ChG MFs for mid-IR Raman lasers, frequency combs and supercontinuum (SC) generation. MF-based spectroscopy and chemical/biological sensors are also introduced. Finally, we conclude the review with a brief summary and an outlook on future challenges and opportunities of ChG MFs.

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Reconfiguration of the Pattern and Transmission Spectrum in Near Infrared Band by Plasmon Nano-Optical Antenna

10.20944/preprints201906.0168.v1 ◽

2019 ◽

Author(s):

Dong-zhou Zhong ◽

Hua Yang ◽

Neng Zeng ◽

Guang-Ze Yang ◽

Jun-Long Zhou

Keyword(s):

Transmission Spectrum ◽

Near Infrared ◽

Near Field ◽

Field Pattern ◽

Optical Antenna ◽

Far Field ◽

Infrared Band ◽

Yagi Antenna ◽

Field Radiation ◽

Far Field Pattern

We propose a novel plasmon nano-optical antenna that consists of three vertically superimposed discs with different materials. Two symmetrical nanometer-scale Yagi antenna elements with gold-material are embedded into the surface of the middle disc with silicon dioxide. Based on plasmon theory and Yagi antenna principle, we explore the properties of the far-field radiation and near-field transmission of the antenna in near infrared band. It is found that the pattern of the xoy plane in the antenna can be adjusted in arbitrary direction. The far-field pattern and near-field transmission spectrum can be reconfigured by changing the angle a of the Yagi antenna elements in the middle disc. Moreover, we also discuss the influences of the widths and lengths of the elements on the near-field transmission spectrum when a is fixed at 0 degree.

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Planar Multilayered 2D GeAs Schottky Photodiode for High-Performance Visible–Near-Infrared Photodetection

ACS Applied Materials & Interfaces ◽

10.1021/acsami.1c01773 ◽

2021 ◽

Author(s):

Ghada Dushaq ◽

Mahmoud Rasras

Keyword(s):

High Performance ◽

Near Infrared ◽

Infrared Photodetection ◽

Schottky Photodiode

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Single-shot imaging of surface molecular ionization in nanosystems

Nanophotonics ◽

10.1515/nanoph-2021-0172 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Fenghao Sun ◽

Hui Li ◽

Shanshan Song ◽

Fei Chen ◽

Jiawei Wang ◽

...

Keyword(s):

Near Infrared ◽

Strong Field ◽

Imaging Technique ◽

Near Field ◽

Velocity Map Imaging ◽

Single Shot ◽

Surface Molecules ◽

Nanoparticle Interactions ◽

Field Response ◽

Ion Species

Abstract Using single-shot velocity map imaging technique, explosion imaging of different ion species ejected from 50 nm SiO2 nanoparticles are obtained excitedly by strong near-infrared and ultraviolet femtosecond laser fields. Characteristic momentum distributions showing forward emission of the ions at low excitation intensities and shock wave behaviors at high intensities are observed. When the excitation intensity is close to the dissociative ionization threshold of the surface molecules, the resulting ion products can be used to image the instant near-field distributions. The underlying dynamics of shock formation are simulated by using a Coulomb explosion model. Our results allow one to distinguish the ultrafast strong-field response of various molecular species in nanosystems and will open a new way for further exploration of the underlying dynamics of laser-and-nanoparticle interactions.

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Prediction of Near-Field Coupling between Misaligned Antennas

1974 IEEE Electromagnetic Compatibility Symposium Record ◽

10.1109/isemc.1974.7567128 ◽

1974 ◽

Author(s):

F. L. Cain ◽

E. E. Weaver ◽

E. F. Duffy

Keyword(s):

Near Field ◽

Field Coupling

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Infrared vibrational nanocrystallography and nanoimaging

Science Advances ◽

10.1126/sciadv.1601006 ◽

2016 ◽

Vol 2 (10) ◽

pp. e1601006 ◽

Cited By ~ 39

Author(s):

Eric A. Muller ◽

Benjamin Pollard ◽

Hans A. Bechtel ◽

Peter van Blerkom ◽

Markus B. Raschke

Keyword(s):

Ion Mobility ◽

Molecular Orientation ◽

Hybrid Imaging ◽

Defect Formation ◽

Near Field ◽

Molecular Solids ◽

Optical Antenna ◽

Molecular Bond ◽

Low Symmetry ◽

Insight Into

Molecular solids and polymers can form low-symmetry crystal structures that exhibit anisotropic electron and ion mobility in engineered devices or biological systems. The distribution of molecular orientation and disorder then controls the macroscopic material response, yet it is difficult to image with conventional techniques on the nanoscale. We demonstrated a new form of optical nanocrystallography that combines scattering-type scanning near-field optical microscopy with both optical antenna and tip-selective infrared vibrational spectroscopy. From the symmetry-selective probing of molecular bond orientation with nanometer spatial resolution, we determined crystalline phases and orientation in aggregates and films of the organic electronic material perylenetetracarboxylic dianhydride. Mapping disorder within and between individual nanoscale domains, the correlative hybrid imaging of nanoscale heterogeneity provides insight into defect formation and propagation during growth in functional molecular solids.

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