High-Performance Tunable Multichannel Absorbers Coupled with Graphene-Based Grating and Dual-Tamm Plasmonic Structures

Plasmonics ◽  
2021 ◽  
Author(s):  
Jinlei Hu ◽  
Zhengda Hu ◽  
Jicheng Wang ◽  
Aliaksei Balmakou ◽  
Sergei Khakhomov ◽  
...  
Keyword(s):  
High Performance ◽  
Plasmonic Structures

scholarly journals Bioscaffold arrays decorated with Ag nanoparticles as a SERS substrate for direct detection of melamine in infant formula

RSC Advances ◽  
2019 ◽  
Vol 9 (38) ◽  
pp. 21771-21776 ◽  
Author(s):  
Nan Zhao ◽  
Hefu Li ◽  
Cunwei Tian ◽  
Yanru Xie ◽  
Zhenbao Feng ◽  
...  
Keyword(s):  
High Performance ◽  
Direct Detection ◽  
Three Dimensional ◽  
Sers Substrate ◽  
Sers Substrates ◽  
Plasmonic Structures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Performance Surface

Three-dimensional (3D) plasmonic structures have been intensively investigated as high performance surface enhanced Raman scattering (SERS) substrates.

scholarly journals Realization of Deep UV Plasmonic Enhancement to Photo Response through Al Mesh

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3252
Author(s):  
Gaoming Li ◽  
Jingwen Zhang ◽  
Yaoting Hu ◽  
Yongning He
Keyword(s):  
High Performance ◽  
Optical Constants ◽  
Fabrication Method ◽  
Plasmonic Enhancement ◽  
Uv Detectors ◽  
Uv Photodetectors ◽  
Plasmonic Structures ◽  
Supporting Layer ◽  
Photo Response ◽  
Deep Uv

High-performance UV detectors are of great significance for various applications. Plasmonic structures enable great improvement of the performance of detectors. However, to push the plasmonic enhancement to photo response into the deep-UV region presents some challenges. In this work, we found that the optical properties of the supporting layer play important roles in achieving the optimal plasmonic enhancement. Therefore, we fully considered the dependence of the optical constants of the MgZnO supporting layer, which is a promising material to realize deep-UV photodetectors, on microstructure and crystalline quality, which are related to the fabrication method. Based on the optical constants, we designed an Al mesh plasmonic structure and fabricated it with a polystyrene monolayer as a mask. Finally, we demonstrated a three-times enhancement to photo response with UV radiation at 254 nm.

scholarly journals High-performance Tunable Multichannel Absorbers Couple with Graphene-based Grating and Dual-Tamm Plasmonic Structures

2021 ◽  
Author(s):  
Jinlei Hu ◽  
Zhengda Hu ◽  
Jicheng Wang ◽  
Aliaksei Balmakou ◽  
Sergei Khakhomov ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Potential ◽  
Grating Period ◽  
Polarization Angle ◽  
Perfect Absorption ◽  
Plasmonic Structures ◽  
Resonant Modes ◽  
Tamm State ◽  
High Level ◽  
Absorption Filter

Abstract We present a hybrid Tamm system targeting the tunable multichannel absorber. The proposed optical absorber is analyzed and investigated by using the transfer matrix method (TMM). The numerical and theoretical studies show that the four perfect absorption peaks are generated by two types of resonant modes excited in the structure, which can be reasonably explained by the guide-mode resonance (GMR) and optical Tamm state (OTS). More importantly, the strong interaction between the two modes gives rise to mode hybridization by adjusting the grating period. Furthermore, the active modulation of the GMR-based peak can be manipulated discretely by tuning the polarization angle or continuously by changing the chemical potential of graphene. The presented optical absorption filter will meet high level of effectiveness in developing high-performance optoelectronic devices.

scholarly journals Enhancing the Performance of Commercial Infrared Detectors by Surface Plasmons

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 63
Author(s):  
Kirsi Tappura
Keyword(s):  
Surface Plasmons ◽  
Cost Reduction ◽  
Infrared Detectors ◽  
High Performance ◽  
Imaging Systems ◽  
Material System ◽  
Ir Detectors ◽  
Broadband Absorption ◽  
Electromagnetic Simulations ◽  
Plasmonic Structures

The feasibility to improve the response of quantum type (photonic) infrared (IR) detectors by applying surface plasmons is investigated. The HgCdTe material system is used as the detector platform of interest for which selected plasmonic structures and materials are applied and the influence studied by full-fielded electromagnetic simulations. It is shown that even for the several-micrometers-thick detector structures, similar to the commercial ones, broadband absorption enhancements of 30–40% can be achieved. The results suggest that improved, or new, pixel-level functionalities can be created for commercial IR detectors by relatively simple means. Additionally, high potential for cost reduction in high-performance IR imaging systems with multicolour capabilities is foreseen.

scholarly journals Enhancing the Performance of Commercial Infrared Detectors by Surface Plasmons

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1063
Author(s):  
Kirsi Tappura
Keyword(s):  
Surface Plasmons ◽  
Cost Reduction ◽  
Infrared Detectors ◽  
High Performance ◽  
Imaging Systems ◽  
Material System ◽  
Ir Detectors ◽  
Broadband Absorption ◽  
Electromagnetic Simulations ◽  
Plasmonic Structures

The feasibility to improve the response of quantum type (photonic) infrared (IR) detectors by applying surface plasmons is investigated. The HgCdTe material system is used as the detector platform of interest for which selected plasmonic structures and materials are applied and the influence studied by full-fielded electromagnetic simulations. It is shown that even for the several-micrometers-thick detector structures, similar to the commercial ones, broadband absorption enhancements of 30–40% can be achieved. The results suggest that improved, or new, pixel-level functionalities can be created for commercial IR detectors by relatively simple means. Additionally, high potential for cost reduction in high-performance IR imaging systems with multicolour capabilities is foreseen.

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

Use of the Magnetostatic Analogue In Electromagnetic Lens Engineering

1970 ◽  
Vol 28 ◽  
pp. 360-361
Author(s):  
John W. Coleman
Keyword(s):  
Boundary Conditions ◽  
High Performance ◽  
Force Fields ◽  
Optical Design ◽  
Direct Conversion ◽  
Design Engineering ◽  
Design Data ◽  
Scalar Potentials ◽  
Geometric Elements ◽  
At Will

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

Prospects for convergent beam electron diffraction with a 200kV cold field-emission transmission electron microscope

1991 ◽  
Vol 49 ◽  
pp. 466-467
Author(s):  
J W Steeds ◽  
R Vincent
Keyword(s):  
Field Emission ◽  
High Performance ◽  
Small Diameter ◽  
Convergent Beam Electron Diffraction ◽  
Zone Axis ◽  
Medium Voltage ◽  
Transmission Electron ◽  
Good Crystallinity ◽  
Special Modification ◽  
Convergent Beam

We review the analytical powers which will become more widely available as medium voltage (200-300kV) TEMs with facilities for CBED on a nanometre scale come onto the market. Of course, high performance cold field emission STEMs have now been in operation for about twenty years, but it is only in relatively few laboratories that special modification has permitted the performance of CBED experiments. Most notable amongst these pioneering projects is the work in Arizona by Cowley and Spence and, more recently, that in Cambridge by Rodenburg and McMullan.There are a large number of potential advantages of a high intensity, small diameter, focussed probe. We discuss first the advantages for probes larger than the projected unit cell of the crystal under investigation. In this situation we are able to perform CBED on local regions of good crystallinity. Zone axis patterns often contain information which is very sensitive to thickness changes as small as 5nm. In conventional CBED, with a lOnm source, it is very likely that the information will be degraded by thickness averaging within the illuminated area.

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