scholarly journals Far-infrared bands in plasmonic metal-insulator-metal absorbers optimized for long-wave infrared

MRS Advances ◽  
2019 ◽  
Vol 4 (11-12) ◽  
pp. 667-674 ◽  
Author(s):  
Rachel N. Evans ◽  
Seth R. Calhoun ◽  
Jonathan R. Brescia ◽  
Justin W. Cleary ◽  
Evan M. Smith ◽  
...  
Keyword(s):  
Ground Plane ◽  
Wavelength Region ◽  
Wave Model ◽  
Far Infrared ◽  
Resonance Wavelength ◽  
Surface Structures ◽  
Metal Insulator ◽  
Long Wave ◽  
Metal Insulator Metal ◽  
Long Wave Infrared

ABSTRACTMetal–insulator–metal (MIM) resonant absorbers comprise a conducting ground plane, a dielectric of thickness t, and thin separated metal top-surface structures of dimension l. The fundamental resonance wavelength is predicted by an analytic standing-wave model based on t, l, and the dielectric refractive index spectrum. For the dielectrics SiO2, AlN, and TiO2, values for l of a few microns give fundamental resonances in the 8-12 μm long-wave infrared (LWIR) wavelength region. Agreement with theory is better for t/l exceeding 0.1. Harmonics at shorter wavelengths were already known, but we show that there are additional resonances in the far-infrared 20 - 50 μm wavelength range in MIM structures designed to have LWIR fundamental resonances. These new resonances are consistent with the model if far-IR dispersion features in the index spectrum are considered. LWIR fundamental absorptions are experimentally shown to be optimized for a ratio t/l of 0.1 to 0.3 for SiO2- and AlN-based MIM absorbers, respectively, with TiO2-based MIM optimized at an intermediate ratio.

Deep Neural Network Inverse-Design for Long Wave Infrared Hyperspectral Imaging

2021 ◽  
Vol 35 (11) ◽  
pp. 1336-1337
Author(s):  
Clayton Fowler ◽  
Sensong An ◽  
Bowen Zheng ◽  
Hong Tang ◽  
Hang Li ◽  
...  
Keyword(s):  
Neural Networks ◽  
Hyperspectral Imaging ◽  
Electromagnetic Waves ◽  
Deep Neural Networks ◽  
Structural Parameters ◽  
Inverse Design ◽  
Metal Insulator ◽  
Complex Interactions ◽  
Metal Insulator Metal ◽  
Long Wave Infrared

This paper presents a deep learning approach for the inverse-design of metal-insulator-metal metasurfaces for hyperspectral imaging applications. Deep neural networks are able to compensate for the complex interactions between electromagnetic waves and metastructures to efficiently produce design solutions that would be difficult to obtain using other methods. Since electromagnetic spectra are sequential in nature, recurrent neural networks are especially suited for relating such spectra to structural parameters.

scholarly journals Gate-tunable metafilm absorber based on indium silicon oxide

Nanophotonics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1803-1810 ◽  
Author(s):  
Hongwei Zhao ◽  
Ran Zhang ◽  
Hamid T. Chorsi ◽  
Wesley A. Britton ◽  
Yuyao Chen ◽  
...  
Keyword(s):  
Silicon Oxide ◽  
Resonance Wavelength ◽  
Multilayer Structures ◽  
Metal Insulator ◽  
Maximum Change ◽  
Metal Insulator Metal ◽  
Resonator Arrays

AbstractIn this work, reconfigurable metafilm absorbers based on indium silicon oxide (ISO) were investigated. The metafilm absorbers consist of nanoscale metallic resonator arrays on metal-insulator-metal (MIM) multilayer structures. The ISO was used as an active tunable layer embedded in the MIM cavities. The tunable metafilm absorbers with ISO were then fabricated and characterized. A maximum change in the reflectance of 57% and up to 620 nm shift in the resonance wavelength were measured.

Metal-insulator-metal antennas in the far-infrared range based on highly doped InAsSb

2017 ◽  
Vol 111 (12) ◽  
pp. 121108 ◽  
Author(s):  
F. Omeis ◽  
R. Smaali ◽  
F. Gonzalez-Posada ◽  
L. Cerutti ◽  
T. Taliercio ◽  
...  
Keyword(s):  
Far Infrared ◽  
Infrared Range ◽  
Metal Insulator ◽  
Metal Insulator Metal

Effects of substrate phonon absorption on the resonance behavior of metal-insulator-metal metamaterial terahertz absorbers

2021 ◽  
Author(s):  
Tianye Niu ◽  
Boqi Qiu ◽  
Ya Zhang ◽  
Kazuhiko HIRAKAWA
Keyword(s):  
Gaas Substrate ◽  
Ground Plane ◽  
Resonant Absorption ◽  
High Resistivity ◽  
Thz Radiation ◽  
Terahertz Frequency ◽  
Metal Insulator ◽  
Resonance Behavior ◽  
Metal Insulator Metal ◽  
Phonon Absorption

Abstract We have investigated effects of substrate phonon absorption on the resonance behavior of metal-insulator-metal double layer metamaterial absorbers in the terahertz frequency range. A sharp resonant absorption dip is clearly observed for a metamaterial-on-ground-plane structure fabricated on a GaAs substrate when THz radiation is incident from the surface metamaterials side. However, when the THz is incident from the substrate side to the ground-plane-on-metamaterial structures fabricated on a GaAs substrate, the resonance dip is almost merged into the broad background of acoustic phonon absorption. The resonant absorption is recovered when the GaAs substrate is replaced with a high-resistivity Si substrate.

DC bias dependence of metal-insulator-metal diodes as generators of far-infrared radiation

1996 ◽  
Author(s):  
Hitoshi Odashima ◽  
Keiji Kuroda ◽  
Fusakazu Matsushima ◽  
Shozo Tsunekawa ◽  
Kojiro Takagi
Keyword(s):  
Infrared Radiation ◽  
Far Infrared ◽  
Metal Insulator ◽  
Metal Insulator Metal ◽  
Dc Bias ◽  
Far Infrared Radiation

Smooth TiO2 Thin Films Grown by Aqueous Spray Deposition for Long-Wave Infrared Applications

MRS Advances ◽  
2018 ◽  
Vol 3 (5) ◽  
pp. 255-260 ◽  
Author(s):  
Sarmad Fawzi Hamza Alhasan ◽  
Seth R. Calhoun ◽  
Hussain Abouelkhair ◽  
Vanessa C. Lowry ◽  
Robert E. Peale ◽  
...  
Keyword(s):  
Spray Deposition ◽  
Low Cost ◽  
Large Area ◽  
Tio2 Thin Films ◽  
Long Wave ◽  
Nano Crystalline ◽  
Metal Insulator Metal ◽  
Pressure Chemical ◽  
Indirect Band Gap ◽  
Long Wave Infrared

ABSTRACTSelf-assembled TiO2 films deposited by aqueous-spray deposition were investigated to evaluate morphology, crystalline phase, and infrared optical constants. The Anatase nano-crystalline film had ∼10 nm characteristic surface roughness sparsely punctuated by defects of not more than 200 nm amplitude. The film is highly transparent throughout the visible to wavelengths of 12 μm. The indirect band gap was determined to be 3.2 eV. Important for long-wave infrared applications is that dispersion in this region is weak compared with the more commonly used dielectric SiO2 for planar structures. An example application to a metal-insulator-metal resonant absorber is presented. The low-cost, large-area, atmospheric-pressure, chemical spray deposition method allows conformal fabrication on flexible substrates for long-wave infrared photonics.

scholarly journals Ultrahigh Sensitivity of a Plasmonic Pressure Sensor with a Compact Size

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3147
Author(s):  
Chung-Ting Chou Chao ◽  
Yuan-Fong Chou Chau ◽  
Sy-Hann Chen ◽  
Hung Ji Huang ◽  
Chee Ming Lim ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Simple Structure ◽  
Resonance Wavelength ◽  
Wavelength Shift ◽  
The Finite Element Method ◽  
Metal Insulator ◽  
Compact Size ◽  
Metal Insulator Metal ◽  
Ultrahigh Sensitivity ◽  
Metal Pressure

This study proposes a compact plasmonic metal-insulator-metal pressure sensor comprising a bus waveguide and a resonator, including one horizontal slot and several stubs. We calculate the transmittance spectrum and the electromagnetic field distribution using the finite element method. When the resonator’s top layer undergoes pressure, the resonance wavelength redshifts with increasing deformation, and their relation is nearly linear. The designed pressure sensor possesses the merits of ultrahigh sensitivity, multiple modes, and a simple structure. The maximum sensitivity and resonance wavelength shift can achieve 592.44 nm/MPa and 364 nm, respectively, which are the highest values to our knowledge. The obtained sensitivity shows 23.32 times compared to the highest one reported in the literature. The modeled design paves a promising path for applications in the nanophotonic field.

scholarly journals A Numerical Investigation of a Plasmonic Sensor Based on a Metal-Insulator-Metal Waveguide for Simultaneous Detection of Biological Analytes and Ambient Temperature

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2551
Author(s):  
Nikolay L. Kazanskiy ◽  
Svetlana N. Khonina ◽  
Muhammad A. Butt ◽  
Andrzej Kaźmierczak ◽  
Ryszard Piramidowicz
Keyword(s):  
Ambient Temperature ◽  
Simultaneous Detection ◽  
Resonance Wavelength ◽  
Temperature Sensing ◽  
Sensor Design ◽  
Plasmonic Sensor ◽  
Metal Insulator ◽  
Sensing Applications ◽  
Metal Insulator Metal ◽  
Biological Analytes

A multipurpose plasmonic sensor design based on a metal-insulator-metal (MIM) waveguide is numerically investigated in this paper. The proposed design can be instantaneously employed for biosensing and temperature sensing applications. The sensor consists of two simple resonant cavities having a square and circular shape, with the side coupled to an MIM bus waveguide. For biosensing operation, the analytes can be injected into the square cavity while a thermo-optic polymer is deposited in the circular cavity, which provides a shift in resonance wavelength according to the variation in ambient temperature. Both sensing processes work independently. Each cavity provides a resonance dip at a distinct position in the transmission spectrum of the sensor, which does not obscure the analysis process. Such a simple configuration embedded in the single-chip can potentially provide a sensitivity of 700 nm/RIU and −0.35 nm/°C for biosensing and temperature sensing, respectively. Furthermore, the figure of merit (FOM) for the biosensing module and temperature sensing module is around 21.9 and 0.008, respectively. FOM is the ratio between the sensitivity of the device and width of the resonance dip. We suppose that the suggested sensor design can be valuable in twofold ways: (i) in the scenarios where the testing of the biological analytes should be conducted in a controlled temperature environment and (ii) for reducing the influence on ambient temperature fluctuations on refractometric measurements in real-time mode.

Characteristics of metal-insulator-metal diodes as generators of far-infrared radiation

1996 ◽  
Vol 32 (2) ◽  
pp. 350-356 ◽  
Author(s):  
H. Odashima ◽  
K. Yamamoto ◽  
F. Matsushima ◽  
S. Tsunekawa ◽  
K. Takagi
Keyword(s):  
Infrared Radiation ◽  
Far Infrared ◽  
Metal Insulator ◽  
Metal Insulator Metal ◽  
Far Infrared Radiation

Effect of Compound Dielectric and Metal Thinning on Metal-Insulator-Metal Resonant Absorbers for Multispectral Infrared Air-Bridge Bolometers

MRS Advances ◽  
2017 ◽  
Vol 2 (42) ◽  
pp. 2281-2286 ◽  
Author(s):  
Robert E. Peale ◽  
Seth Calhoun ◽  
Chris J. Fredricksen ◽  
Evan Smith ◽  
Shiva Vangala ◽  
...  
Keyword(s):  
Response Times ◽  
Resonance Wavelength ◽  
Thermal Mass ◽  
Metal Insulator ◽  
Metal Insulator Metal

ABSTRACTAddition of wavelength selective absorbers on microbolometers tends to increase their thermal mass and slow their infrared response times. Making the bolometric material an integral part of the absorber and minimizing layer thicknesses is one possible way to maintain high detector speeds. Here, we study experimentally the effect on permittivity of adding a layer of semiconducting VOx between two layers of SiO2. Additionally, we investigate theoretically the effect on resonance wavelength of thinning the metal in metal-insulator-metal plasmonic resonant absorbers.

Sign in / Sign up

Export Citation Format

Share Document