Metallic metasurface as a directional and monochromatic thermal emitter

2015 ◽  
Author(s):  
Francois Marquier ◽  
Daniele Costantini ◽  
Anthony Lefebvre ◽  
Anne-Lise Coutrot ◽  
Ioana Moldovan-Doyen ◽  
...  
Keyword(s):  
Thermal Emitter

Low-workfunction field-emission source for high-resolution EELS

1987 ◽  
Vol 45 ◽  
pp. 132-133
Author(s):  
P. E. Batson
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Electron Probe ◽  
Collection Efficiency ◽  
Electron Sources ◽  
Wien Filter ◽  
Half Angle ◽  
Thermal Emitter ◽  
Electron Energy Loss ◽  
Intrinsic Energy

In recent years,instrumentation for electron energy loss spectroscopy (EELS) has been steadily improved to increase energy resolution and collection efficiency. At present 0.40eV at 10mR collection half angle is available with commercial magnetic sectors (e.g. Gatan, Inc. and VG Microscopes, Ltd.), and 70meV at 10mR has been demonstrated by use of a Wien filter within a large deceleration field. When these high resolution spectrometers are coupled to the modern small electron probe instrument, we obtain a tool which promises to reveal local changes in bandstructure and bonding near defects and interfaces in heterogeneous materials.Unfortunately, typical electron sources have intrinsic energy widths which limit attainable spectroscopic resolution in the absence of some monochromation system. For instance, the W thermal emitter has a half width of about 1eV.

scholarly journals Hyperspectral Molecular Orientation Mapping in Metamaterials

2021 ◽  
Vol 11 (4) ◽  
pp. 1544
Author(s):  
Meguya Ryu ◽  
Yoshiaki Nishijima ◽  
Shinya Morimoto ◽  
Naoki To ◽  
Tomoki Hashizume ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Field Enhancement ◽  
Chemical Mapping ◽  
Metal Insulator ◽  
Orientation Mapping ◽  
Metal Insulator Metal ◽  
Finger Printing ◽  
Thermal Emitter ◽  
Ir Bands ◽  
Sub Wavelength

The four polarisation method is adopted for measurement of molecular orientation in dielectric nanolayers of metal-insulator-metal (MIM) metamaterials composed of gold nanodisks on polyimide and gold films. Hyperspectral mapping at the chemical finger printing spectral range of 4–20 μμm was carried out for MIM patterns of 1–2.5 μμm period (sub-wavelength). Overlay images taken at 0,π4,π2,3π4 orientation angles and subsequent baseline compensation are shown to be critically important for the interpretation of chemical mapping results and reduction of spurious artefacts. Light field enhancement in the 60-nm-thick polyimide (I in MIM) was responsible for strong absorption at the characteristic polyimide bands. Strong absorbance A at narrow IR bands can be used as a thermal emitter (emittance E=1−R), where R is the reflectance and A=1−R−T, where for optically thick samples the transmittance is T=0.

scholarly journals On-Chip Narrowband Thermal Emitter for Mid-IR Optical Gas Sensing

ACS Photonics ◽  
2017 ◽  
Vol 4 (6) ◽  
pp. 1371-1380 ◽  
Author(s):  
Alexander Lochbaum ◽  
Yuriy Fedoryshyn ◽  
Alexander Dorodnyy ◽  
Ueli Koch ◽  
Christian Hafner ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Thermal Emitter ◽  
Optical Gas Sensing ◽  
On Chip

scholarly journals Aperiodic multilayer graphene based tunable and switchable thermal emitter at mid-infrared frequencies

2018 ◽  
Vol 124 (23) ◽  
pp. 233101 ◽  
Author(s):  
S. Sharifi ◽  
Y. M. Banadaki ◽  
V. F. Nezhad ◽  
G. Veronis ◽  
J. P. Dowling
Keyword(s):  
Multilayer Graphene ◽  
Mid Infrared ◽  
Thermal Emitter ◽  
Infrared Frequencies

Highly tunable thermal emitter with vanadium dioxidemetamaterials for radiative cooling

2021 ◽  
Author(s):  
Yuanlin Jia ◽  
Xiaoxia Wang ◽  
Huaiyuan Yin ◽  
Huawei Yao ◽  
junqiao Wang ◽  
...  
Keyword(s):  
Radiative Cooling ◽  
Thermal Emitter

Demonstration of a mid-wavelength infrared narrowband thermal emitter based on GaN/AlGaN quantum wells and a photonic crystal

2017 ◽  
Vol 110 (18) ◽  
pp. 181109 ◽  
Author(s):  
Dongyeon Daniel Kang ◽  
Takuya Inoue ◽  
Takashi Asano ◽  
Susumu Noda
Keyword(s):  
Photonic Crystal ◽  
Quantum Wells ◽  
Thermal Emitter

scholarly journals Tunable Narrowband Silicon-Based Thermal Emitter with Excellent High-Temperature Stability Fabricated by Lithography-Free Methods

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1814
Author(s):  
Guozhi Hou ◽  
Qingyuan Wang ◽  
Yu Zhu ◽  
Zhangbo Lu ◽  
Jun Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Absorption Spectra ◽  
Fdtd Method ◽  
Temperature Stability ◽  
High Energy ◽  
Structure Design ◽  
Bragg Reflector ◽  
High Temperature Stability ◽  
Absorption Performance ◽  
Thermal Emitter

Thermal emitters with properties of wavelength-selective and narrowband have been highly sought after for a variety of potential applications due to their high energy efficiency in the mid-infrared spectral range. In this study, we theoretically and experimentally demonstrate the tunable narrowband thermal emitter based on fully planar Si-W-SiN/SiNO multilayer, which is realized by the excitation of Tamm plasmon polaritons between a W layer and a SiN/SiNO-distributed Bragg reflector. In conjunction with electromagnetic simulations by the FDTD method, the optimum structure design of the emitter is implemented by 2.5 periods of DBR structure, and the corresponding emitter exhibits the nearly perfect narrowband absorption performance at the resonance wavelength and suppressed absorption performance in long wave range. Additionally, the narrowband absorption peak is insensitive to polarization mode and has a considerable angular tolerance of incident light. Furthermore, the actual high-quality Si-W-SiN/SiNO emitters are fabricated through lithography-free methods including magnetron sputtering and PECVD technology. The experimental absorption spectra of optimized emitters are found to be in good agreement with the simulated absorption spectra, showing the tunable narrowband absorption with all peak values of over 95%. Remarkably, the fabricated Si-W-SiN/SiNO emitter presents excellent high-temperature stability for several heating/cooling cycles confirmed up to 1200 K in Ar ambient. This easy-to-fabricate and tunable narrowband refractory emitter paves the way for practical designs in various photonic and thermal applications, such as thermophotovoltaic and IR radiative heaters.

Sign in / Sign up

Export Citation Format

Share Document