scholarly journals Polarization and Incidence Angle Independent Low-Profile Wideband Metamaterial Electromagnetic Absorber Using Indium Tin Oxide (ITO) Film

2021 ◽  
Vol 11 (19) ◽  
pp. 9315
Author(s):  
Sangmin Park ◽  
Geonyeong Shin ◽  
Hyun Kim ◽  
Youngwan Kim ◽  
Ick-Jae Yoon
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Incidence Angle ◽  
Wide Frequency Range ◽  
Ring Resonators ◽  
Frequency Range ◽  
Split Ring ◽  
Ito Film ◽  
Full Wave ◽  
Low Profile

We use indium tin oxide (ITO), one of the representative resistive materials, for the implementation of a metamaterial electromagnetic (EM) absorber with a high absorbance in a wide frequency range. Highly symmetrical split ring resonators made of ITO film are deposited on the polyethylene terephthalate with transparent and flexible features, and such a configuration causes the proposed absorber to be insensitive to polarization and incidence angles. The proposed absorber, with a profile of only 0.171, exhibits a wideband absorbance of 7.2 GHz to 27 GHz, with a 90% absorption criterion. A prototype is built, and all the computed expectations from the full-wave EM simulations in this work are verified experimentally.

scholarly journals Multiband linear and circular polarization rotating metasurface based on multiple plasmonic resonances for C, X and K band applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Ismail Khan ◽  
Yixiao Chen ◽  
Bin Hu ◽  
Naeem Ullah ◽  
Syed Hashim Raza Bukhari ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Transverse Magnetic ◽  
Wide Frequency Range ◽  
Ultra Wideband ◽  
Ring Resonators ◽  
Frequency Range ◽  
Split Ring ◽  
Compact Structure ◽  
Frequency Bands ◽  
Satellite Radar

Abstract In this work, a multiband polarization converting metasurface is presented which achieves cross-polarization conversion in five frequency bands while linear-to-circular and circular-to-linear polarization transformation in eight frequency bands. The polarization transforming functionality of the structure is spread over an ultra-wide frequency range (5–37 GHz) covering most of X, C, Ku, K and Ka bands. Such an extraordinary ultra-wideband operation originates from multiple plasmonic resonances occurring in the structure based on two coupled rectangular split-ring resonators. Moreover, the polarization transforming capability is stable within the frequency range 5–19 GHz for wide oblique incidence angles, which is up to 60°, both for transverse-electric and transverse-magnetic polarizations. Furthermore, the proposed structure acts as a meta-mirror which preserves handedness of the circular polarization upon reflection. Measurements performed on the fabricated metasurface are found to be consistent with numerical simulation results. The ability to perform three functionalities through a single compact structure with extraordinary wideband, qualifies the proposed design to be a promising candidate for integration with important microwave applications such as satellite, radar, and 5G communication.

Tunable and switchable resonance in optically-controlled nested metamaterials at terahertz frequencies

2016 ◽  
Vol 30 (03) ◽  
pp. 1650011
Author(s):  
Yong-Li Che ◽  
Xiao-Long Cao ◽  
Jian-Quan Yao
Keyword(s):  
Gallium Arsenide ◽  
Quartz Substrate ◽  
Optical Excitation ◽  
Ring Resonators ◽  
Metallic State ◽  
Frequency Range ◽  
Metamaterial Structure ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Terahertz Frequencies

The asymmetrical nested metamaterial, composed of two split-ring resonators (SRRs) and two embedded gallium arsenide (GaAs) islands placed in the two SRRs, has been elaborately designed on quartz substrate. Its tunable and switchable resonances at terahertz (THz) frequencies are numerically demonstrated here based on different conductivities of GaAs, which can be transformed from semiconductor to metallic state through appropriate optical excitation. Without photoexcitation, our designed metamaterial has three resonance peaks in the range of monitored frequency range, and they are located at 0.813, 1.269 and 1.722 THz, respectively. As the conductivity of the two GaAs islands increases, different new resonances appear and constantly strengthen. Finally, four new resonant points are generated, at 0.432, 0.948, 1.578 and 1.875 THz, respectively. At the same time, the metamaterial structure is changed from the original nested mode to a new integral mode. Applying reversible changing conductivity of semiconductor to push the conversion of resonance, this asymmetrical nested design provides a new instance in application and development of additional THz devices.

Design of multi-layered bandpass filter with independently controllable triple-passband response

2014 ◽  
Vol 6 (6) ◽  
pp. 611-618 ◽  
Author(s):  
Yung-Wei Chen ◽  
Hung-Wei Wu ◽  
Yan-Kuin Su
Keyword(s):  
Frequency Response ◽  
Bandpass Filter ◽  
Bottom Layer ◽  
Wide Frequency Range ◽  
Electromagnetic Simulation ◽  
Frequency Range ◽  
High Isolation ◽  
Full Wave ◽  
Simulation Results ◽  
Good Agreement

In this paper, a new multi-layered triple-passband bandpass filter using embedded and stub-loaded stepped impedance resonators (SIRs) is proposed. The filter is designed to have triple-passband at 1.8, 2.4, and 3.5 GHz. The 1st and 2nd passbands (1.8/2.4 GHz) are simultaneously generated by controlling the impedance and length ratios of the embedded SIRs (on top layer). The 3rd passband (3.5 GHz) is generated by using the stub-loaded SIR (on bottom layer). Using the embedded SIR, the even modes can be tuned within very wide frequency range and without affecting the odd modes. Therefore, the design of multi-band filters with very close passbands can be easily achieved and having a high isolation between the passbands. The filter can provide the multi-path propagation to enhance the frequency response and achieving the compact circuit size. The measured results are in good agreement with the full-wave electromagnetic simulation results.

Analytical circuit model for split ring resonators in the far infrared and optical frequency range

Metamaterials ◽  
2009 ◽  
Vol 3 (2) ◽  
pp. 57-62 ◽  
Author(s):  
V. Delgado ◽  
O. Sydoruk ◽  
E. Tatartschuk ◽  
R. Marqués ◽  
M.J. Freire ◽  
...  
Keyword(s):  
Far Infrared ◽  
Circuit Model ◽  
Ring Resonators ◽  
Optical Frequency ◽  
Frequency Range ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Optical Frequency Range

Characterization of indium tin oxide film and practical ITO film by electron microscopy

2000 ◽  
Vol 370 (1-2) ◽  
pp. 155-162 ◽  
Author(s):  
T. Nakao ◽  
T. Nakada ◽  
Y. Nakayama ◽  
K. Miyatani ◽  
Y. Kimura ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Oxide Film ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Ito Film

The Mechanical Reliability of Sputter-Coated Indium Tin Oxide Polyester Substrates for Flexible Display and Touchscreen Applications

2001 ◽  
Vol 666 ◽  
Author(s):  
Darran R. Cairns ◽  
David C. Paine ◽  
Gregory P. Crawford
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Liquid Crystal Displays ◽  
Mechanical Reliability ◽  
Flexible Display ◽  
Ito Film ◽  
Polyethylene Terephthalate Substrate ◽  
Electrical Reliability ◽  
New Generation ◽  
Over Time

ABSTRACTIndium tin oxide (ITO) films deposited on polyester substrates are a key material in the development of two exciting technologies, touchscreens and flexible liquid crystal displays. The new generation “plastic” displays and touchscreens must be flexible and robust, have excellent optical properties, and be inexpensive. We report on the mechanical and electrical reliability of ITO on a polyethylene terephthalate substrate (PET). We show that the mechanical behavior of the ITO film is dominated by the properties of the substrate and that the deformation of the substrate is mapped by the crack patterns in the ITO. This is most strongly evidenced in the simulated wear of a touchscreen where failure after >50000 pen strokes is primarily due to cracking of the ITO as a result of increased substrate deformation over time. In addition the mechanical reliability of the ITO layer is dependent on the film thickness. Cracking was observed in a 105 nm thick ITO film at a strain of 0.022 and for a 16.8 nm thick film at 0.003. The thickness and hence sheet resistance of the film effectively limits the maximum allowable deformation of the substrate and must be considered in the design of suitable display and touchscreen devices. In addition we report on the change in resistance with time-at- temperature and relate this to the shrinkage of the substrate.

The performance of an inspection system for indium tin oxide circuits by using a PDLC/ITO film

2013 ◽  
Author(s):  
C.-H. Chan ◽  
Y.-T. Zou ◽  
C.-T. Chen ◽  
T.-K. Liu ◽  
C.-H. Chen ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Inspection System ◽  
Ito Film

scholarly journals Optically Transparent Metasurface Absorber Based on Reconfigurable and Flexible Indium Tin Oxide Film

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1032
Author(s):  
Lei Chen ◽  
Ying Ruan ◽  
Si Si Luo ◽  
Fu Ju Ye ◽  
Hao Yang Cui
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Air Permeability ◽  
Ultra Wideband ◽  
Reflection Coefficients ◽  
Transmission And Reflection Coefficients ◽  
Ito Film ◽  
Optically Transparent ◽  
Transmission And Reflection ◽  
Good Agreement

In this paper, we present a flexible, breathable and optically transparent metasurface with ultra-wideband absorption. The designed double layer of indium tin oxide (ITO) films with specific carved structure realizes absorption and electromagnetic (EM) isolation in dual-polarization, as well as good air permeability. Under the illumination of x- and y-polarization incidence, the metasurface has low reflectivity and transmission from about 2 to 18 GHz. By employing ITO film based on polyethylene terephthalate (PET), the presented metasurface also processes the excellent flexibility and optically transparency, which can be utilized for wearable device application. In addition, the dual-layer design enables mechanically-reconfigurable property of the metasurface. The transmission and reflection coefficients in two polarizations show distinct difference when arranging the different relevant positions of two layers of the metasurface. A sample with 14*14 elements is designed, fabricated and measured, showing good agreement with the simulation results. We envision this work has various potentials in the wearable costume which demands both EM absorption and isolation.

scholarly journals Versatile Mode-Locked Operations in an Er-Doped Fiber Laser with a Film-Type Indium Tin Oxide Saturable Absorber

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 701 ◽  
Author(s):  
Quanxin Guo ◽  
Jie Pan ◽  
Dengwang Li ◽  
Yiming Shen ◽  
Xile Han ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Saturable Absorber ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Dual Wavelength ◽  
Ito Film ◽  
Film Type ◽  
New Type ◽  
Ultrafast Photonics ◽  
Er Doped

We demonstrate the generation of versatile mode-locked operations in an Er-doped fiber laser with an indium tin oxide (ITO) saturable absorber (SA). As an epsilon-near-zero material, ITO has been only used to fashion a mode-locked fiber laser as an ITO nanoparticle-polyvinyl alcohol SA. However, this type of SA cannot work at high power or ensure that the SA materials can be transmitted by the light. Thus, we covered the end face of a fiber with a uniform ITO film using the radio frequency magnetron sputtering technology to fabricate a novel ITO SA. Using this new type of SA, single-wavelength pulses, dual-wavelength pulses, and triple-wavelength multi-pulses were achieved easily. The pulse durations of these mode-locked operations were 1.67, 6.91, and 1 ns, respectively. At the dual-wavelength mode-locked state, the fiber laser could achieve an output power of 2.91 mW and a pulse energy of 1.48 nJ. This study reveals that such a proposed film-type ITO SA has excellent nonlinear absorption properties, which can promote the application of ITO film for ultrafast photonics.

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