scholarly journals Broadband Absorption Tailoring of SiO2/Cu/ITO Arrays Based on Hybrid Coupled Resonance Mode

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 852 ◽  
Author(s):  
Jiqing Lian ◽  
Dawei Zhang ◽  
Ruijin Hong ◽  
Tingzhen Yan ◽  
Taiguo Lv ◽  
...  
Keyword(s):  
Near Infrared ◽  
Broad Band ◽  
Fdtd Method ◽  
Local Surface Plasmon Resonance ◽  
Cross Sectional ◽  
Broadband Absorption ◽  
Gap Resonance ◽  
Optical Applications ◽  
Difference Time ◽  
Sub Wavelength

Sub-wavelength artificial photonic structures can be introduced to tailor and modulate the spectrum of materials, thus expanding the optical applications of these materials. On the basis of SiO2/Cu/ITO arrays, a hybrid coupled resonance (HCR) mechanism, including the epsilon-near-zero (ENZ) mode of ITO, local surface plasmon resonance (LSPR) mode and the microstructural gap resonance (GR) mode, was proposed and researched by systematically regulating the array period and layer thickness. The optical absorptions of the arrays were simulated under different conditions by the finite-difference time-domain (FDTD) method. ITO films were prepared and characterized to verify the existence of ENZ mode and Mie theory was used to describe the LSPR mode. The cross-sectional electric field distribution was analyzed while SiO2/Cu/ITO multilayers were also fabricated, of which absorption was measured and calculated by Macleod simulation to prove the existence of GR and LSPR mode. Finally, the broad-band tailoring of optical absorption peaks from 673 nm to 1873 nm with the intensities from 1.8 to 0.41 was realized, which expands the applications of ITO-based plasmonic metamaterials in the near infrared (NIR) region.

A SILVER-COATED SINUSOIDAL SUB-WAVELENGTH STRUCTURE WITH POLARIZATION FEATURE FOR LIGHT EMITTING DIODE

2009 ◽  
Vol 16 (04) ◽  
pp. 631-634 ◽  
Author(s):  
CHENG-HAO KO ◽  
JIAN-SHIAN LIN ◽  
CHANG-TAI CHEN ◽  
NIEN-PO CHEN
Keyword(s):  
Light Emitting Diode ◽  
Red Light ◽  
Fdtd Method ◽  
Dielectric Materials ◽  
Transmission Efficiency ◽  
Light Emitting ◽  
Light Region ◽  
Fluorescence Efficiency ◽  
Difference Time ◽  
Sub Wavelength

A two-dimensional sub-wavelength grating (SWG) is fabricated on light-emitting diodes (LEDs). The SWG is simulated by finite-difference time-domain (FDTD) method. The SWG surface has silver-coated dielectric materials with sinusoidal structures, 175 nm period and 125 m depth of groove. When the incident wave is in the red light region of 600–700nm, the transmission efficiency of TM propagated light will reach 0.82. If this SWG structure is applied in LCD direct backlight module, the lower polarization piece can be replaced and fluorescence efficiency of LED can be improved.

The Theoretical Study of TM Transmittance and Contrast Ratio for Sub-Wavelength Metallic Gratings

2014 ◽  
Vol 575 ◽  
pp. 138-141
Author(s):  
Ren Cheng Jin ◽  
Yang Rui ◽  
Jin Kui Chu ◽  
Ying Jie Zhang
Keyword(s):  
Performance Indicators ◽  
Theoretical Study ◽  
Structural Parameters ◽  
Contrast Ratio ◽  
Fdtd Method ◽  
Slit Width ◽  
Wave Band ◽  
Metallic Gratings ◽  
Difference Time ◽  
Sub Wavelength

According to the requirement of the bionic navigation sensitive wave band of 380nm~520nm for sub-wavelength metallic gratings, in order to achieve performance indicators under the basic structural parameters. Analyzing TM transmittance and contrast ratio is carried out by employing finite-difference time-domain (FDTD) method. The result reveals that height, slit width and dielectric of grating impact TM transmittance and contrast ratio in various extents, and the greatest influence on the TM transmittance and contrast ratio is slit dielectric and slit width respectively.

Metallic Ellipsoidal Array – Film for Enhancing Transmission via Plasmonic Coupling

2014 ◽  
Vol 548-549 ◽  
pp. 393-396
Author(s):  
Ying Hu ◽  
Gui Qiang Liu ◽  
Xiang Nan Zhang ◽  
Yuan Hao Chen ◽  
Zheng Jie Cai ◽  
...  
Keyword(s):  
Slow Light ◽  
Fdtd Method ◽  
Three Dimensional ◽  
Metal Structure ◽  
Transparent Conductors ◽  
Long Wavelength ◽  
Highly Sensitive ◽  
Highly Sensitive Sensors ◽  
Difference Time ◽  
Sub Wavelength

In this paper, a novel metal structure that integrates double continuous Au films and double aligned gold (Au) non-close-packed ellipsoidal nanoparticle arrays is proposed. The optical features of this structure are simulated by using the three-dimensional finite-difference time-domain (3D-FDTD) method. Bimodal plasmonic resonances with the highest transmission up to 74% and 66% (corresponding to the short and long-wavelength, respectively) are achieved. This proposed structure with sub-wavelength size may provide fascinating applications in optoelectronic devices such as transparent conductors and conductive devices, slow light devices, highly sensitive sensors.

scholarly journals Tunable Mid-Infrared Graphene Plasmonic Cross-Shaped Resonator for Demultiplexing Application

2020 ◽  
Vol 10 (3) ◽  
pp. 1193 ◽  
Author(s):  
Somayyeh Asgari ◽  
Tapio Fabritius
Keyword(s):  
Fdtd Method ◽  
Three Dimensional ◽  
Single Mode ◽  
Transmission Spectra ◽  
Mid Infrared ◽  
Coupled Mode ◽  
Light Waves ◽  
Dimensional Parameters ◽  
Difference Time ◽  
Sub Wavelength

In this study, a tunable graphene plasmonic filter and a two-channel demultiplexer are proposed, simulated, and analyzed in the mid-infrared (MIR) region. We discuss the optical transmission spectra of the proposed cross-shaped resonator and the two-channel demultiplexer. The transmission spectra of the proposed MIR resonator are tunable by change of its dimensional parameters and the Fermi energy of the graphene. Our proposed structures have a single mode in the wavelength range of 5–12 µm. The minimum full width at half maximum (FWHM) and the maximum transmission ratio of the proposed resonator respectively reached 220 nm and 55%. Simulations are performed by use of three-dimensional finite-difference time-domain (3D-FDTD) method. Coupled mode theory (CMT) is used to investigate the structure theoretically. The numerical and the theoretical results are in good agreement. The performance of the proposed two-channel demultiplexer is investigated based on its crosstalk. The minimum value of crosstalk reaches −48.30 dB. Our proposed structures are capable of providing sub-wavelength confinement of light waves, useful in applications in MIR region.

scholarly journals A Plasmonic Chip-Scale Refractive Index Sensor Design Based on Multiple Fano Resonances

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3181 ◽  
Author(s):  
Kunhua Wen ◽  
Li Chen ◽  
Jinyun Zhou ◽  
Liang Lei ◽  
Yihong Fang
Keyword(s):  
Refractive Index ◽  
Fdtd Method ◽  
High Sensitivity ◽  
Refractive Index Sensor ◽  
Fano Resonances ◽  
Metal Insulator Metal ◽  
High Figure ◽  
On Chip ◽  
Difference Time ◽  
Sub Wavelength

In this paper, multiple Fano resonances preferred in the refractive index sensing area are achieved based on sub-wavelength metal-insulator-metal (MIM) waveguides. Two slot cavities, which are placed between or above the MIM waveguides, can support the bright modes or the dark modes, respectively. Owing to the mode interferences, dual Fano resonances with obvious asymmetrical spectral responses are achieved. High sensitivity and high figure of merit are investigated by using the finite-difference time-domain (FDTD) method. In view of the development of chip-scale integrated photonics, two extra slot cavities are successively added to the structure, and consequently, three and four ultra-sharp Fano peaks with considerable performances are obtained, respectively. It is believed that this proposed structure can find important applications in the on-chip optical sensing and optical communication areas.

Design and Analysis of High Absorber Based on Sub-Wavelength Grating Structure

2017 ◽  
Vol 872 ◽  
pp. 89-93
Author(s):  
Kun Li ◽  
Yu Qing Xiong ◽  
Sheng Zhu Cao ◽  
Kai Feng Zhang ◽  
Hu Wang ◽  
...  
Keyword(s):  
Finite Difference Time Domain ◽  
Electric Field Distribution ◽  
Layer Structure ◽  
Single Layer ◽  
Double Layers ◽  
Broadband Absorption ◽  
Grating Structure ◽  
Difference Time ◽  
High Absorption ◽  
Sub Wavelength

Two kinds of high absorber were designed based on sub-wavelength grating structure for aluminum substrate. The absorption and electric field distribution of these two structures were calculated by using the finite difference time domain method. One absorber was obtained by using Al2O3/SiO2 double layers and Al rectangular sub-wavelength layer which has high absorption peaks both in TE polarization and TM polarization in infrared spectrum. Another absorber was a single layer structure with a triangular sub-wavelength grating structure which had a broadband absorption in TE polarization at spectral range of 300-1000nm.Simulation results showed that the absorption of this absorber increase and then decreases with the increasing of the height of sub-wavelength grating. The average absorption reached the maximum when the height of grating was 800nm.

Fabrication, Structural Characterization and Optical Properties of Oversized ZnO Microwires

NANO ◽  
2017 ◽  
Vol 12 (07) ◽  
pp. 1750081 ◽  
Author(s):  
S. S. Yan ◽  
H. Zhang ◽  
Fahad Azad ◽  
S. C. Su
Keyword(s):  
Optical Properties ◽  
Optical Waveguides ◽  
Fdtd Method ◽  
Chemical Vapor ◽  
Temperature Dependent ◽  
Cross Sectional ◽  
Whispering Gallery ◽  
Potential Applications ◽  
2D Fdtd ◽  
Difference Time

In this paper, large-sized ZnO microwires (MWs) were successfully synthesized without using any catalyst, following a simple chemical vapor deposition (CVD) method. Highly crystalline ZnO MWs of several hundred micrometers length having diameter in the range of 10–40[Formula: see text][Formula: see text]m were obtained. The synthesized MWs showed a hexagonal cross-sectional morphology and the longest MW was found to be 1[Formula: see text]mm long. The structural and optical properties of an individual large sized ZnO MWs were studied. Temperature-dependent photoluminescence (PL) spectra showed emissions for free excitons (FX) and donor-bound excitons (D0X) and decomposition of the D0X into FX was observed beyond 140[Formula: see text]K. The whispering gallery mode (WGM) lasing in an individual ZnO MW was achieved and also confirmed by two-dimensional finite difference time domain (2D-FDTD) method. These oversized ZnO MWs may find potential applications as WGM resonant cavities and optical waveguides.

An ordered copper nanowell-array film with near-perfect broadband absorption from ultraviolet to near-infrared light

2020 ◽  
Vol 59 (11) ◽  
pp. 110906
Author(s):  
Juan Shen ◽  
Yong Ren ◽  
Xinxin Zhu ◽  
Min Mao ◽  
Quan Zhou ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Broadband Absorption

Black Silicon Germanium (SiGe) for Extended Wavelength Near Infrared Electro-optical Applications

2010 ◽  
Author(s):  
Fred Semendy ◽  
Patrick Taylor ◽  
Gregory Meissner ◽  
Priyalal Wijewarnasuriya
Keyword(s):  
Silicon Germanium ◽  
Near Infrared ◽  
Black Silicon ◽  
Optical Applications

scholarly journals Broadband Absorption in Patterned Metal/Weakly-Absorbing-Spacer/Metal with Graded Photonic Super-Crystal

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 114
Author(s):  
Steve Kamau ◽  
Safaa Hassan ◽  
Khadijah Alnasser ◽  
Hualiang Zhang ◽  
Jingbiao Cui ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Near Infrared ◽  
Broadband Absorption ◽  
Au Film ◽  
Fabry Perot ◽  
Absorbing Material ◽  
Multiple Band ◽  
Band Absorption ◽  
Plasmon Polaritons

It is challenging to realize the complete broadband absorption of near-infrared in thin optical devices. In this paper, we studied high light absorption in two devices: a stack of Au-pattern/insulator/Au-film and a stack of Au-pattern/weakly-absorbing-material/Au-film where the Au-pattern was structured in graded photonic super-crystal. We observed multiple-band absorption, including one near 1500 nm, in a stack of Au-pattern/spacer/Au-film. The multiple-band absorption is due to the gap surface plasmon polariton when the spacer thickness is less than 30 nm. Broadband absorption appears in the near-infrared when the insulator spacer is replaced by a weakly absorbing material. E-field intensity was simulated and confirmed the formation of gap surface plasmon polaritons and their coupling with Fabry–Pérot resonance.

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