scholarly journals Experimental verification of asymmetric transmission in continuous omega-shaped metamaterials

RSC Advances ◽  
2018 ◽  
Vol 8 (67) ◽  
pp. 38556-38561 ◽  
Author(s):  
Ying-Hua Wang ◽  
Inki Kim ◽  
Ren-Chao Jin ◽  
Heonyeong Jeong ◽  
Jia-Qi Li ◽  
...  
Keyword(s):  
Experimental Verification ◽  
Near Infrared ◽  
Polarized Light ◽  
Infrared Region ◽  
Asymmetric Transmission ◽  
Linearly Polarized ◽  
Near Infrared Region

A bi-layer continuous omega-shaped metamaterial was proposed and fabricated to measure the asymmetric transmission (AT) effect of a linearly polarized light at near-infrared region.

scholarly journals High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2410
Author(s):  
Wenbing Liu ◽  
Lirong Huang ◽  
Jifei Ding ◽  
Chenkai Xie ◽  
Yi Luo ◽  
...  
Keyword(s):  
High Performance ◽  
Optical Transmission ◽  
Near Infrared ◽  
Contrast Ratio ◽  
Polarized Light ◽  
Infrared Region ◽  
Optical Systems ◽  
Asymmetric Transmission ◽  
Linearly Polarized ◽  
Transmittance Peak

Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric–metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance peak (with a transmittance of 0.70) and a backward transmittance dip (with a transmittance of 0.07) at the same wavelength of 922 nm, which significantly enhances operation bandwidth and the contrast ratio between forward and backward transmittances. Mechanism analyses reveal that the forward transmittance peak is caused by the unidirectional excitation of surface plasmon polaritons and the first Kerker condition, whereas the backward transmittance dip is due to reflection from the metal film and a strong toroidal dipole response. Our work provides an alternative and simple way to obtain high-performance asymmetric transmission devices.

Surface Plasmon Resonance with Electrospun Nanofibers on Gold Surface

2009 ◽  
Vol 1173 ◽  
Author(s):  
Kazuma Tsuboi ◽  
Hidetoshi Matsumoto ◽  
Mie Minagawa ◽  
Akihiko Tanioka
Keyword(s):  
Surface Plasmon ◽  
Near Infrared ◽  
Polarized Light ◽  
Electrospun Nanofibers ◽  
Gold Surface ◽  
Infrared Region ◽  
Peak Wavelength ◽  
Absorption Bands ◽  
Propagation Length ◽  
Near Infrared Region

AbstractIn this paper we report new excitation method of surface plasmon polariton (SPP) at air/gold interface with electrospun nanofibers. Nanofibers of polyvinylpirrolidone were electrospun onto the surface of a gold film. The observations by scanning electron microscopy and optical microscopy indicated that the average diameters of the nanofibers were about 300 nm and average sizes of pores were about 30-40 μm. Optical response of the nanofibers on gold surface was investigated by polarized reflection absorption spectroscopy (RAS). The RAS spectrum with p-polarized light showed two absorption bands while the spectrum with s-polarized light only one band. One is a band at about 520 nm that also found in the spectrum with s-polarized light. Another is a broad band in the near-infrared region which found only with p-polarized light. The peak intensity of the latter band increases with increase of incident angle of the polarized light and the peak wavelength of the band shifted to longer wavelength. These responses suggested that SPP at air/gold interface was excited with the scattering light from the electrospun nanofibers. We also found that the peak wavelength of the absorption band in near-infrared region changed with the increase of the amount of the nanofibers. This may be due to the fact that the sizes of the pores on gold surface became smaller than the propagation length of SPP, which resulted in scattering and interference of SPP.

THE EFFECT OF HYDROGEN CHLORIDE ON THE NEAR-INFRARED SPECTRUM OF NYLON

1961 ◽  
Vol 39 (12) ◽  
pp. 2394-2399 ◽  
Author(s):  
P. Larose
Keyword(s):  
Infrared Spectrum ◽  
Hydrogen Chloride ◽  
Near Infrared ◽  
Polarized Light ◽  
Infrared Region ◽  
Peptide Linkage ◽  
Near Infrared Region ◽  
Made In ◽  
Near Infrared Spectrum

Samples of oriented nylon film and filament were treated with anhydrous HCl and examined in the near-infrared region of 9000 to 3700 cm−1 with polarized light. The results are in agreement with previous observations made in the 3600–600 cm−1 region, and corroborate earlier evidence that HCl interacts with the peptide linkage. The disorienting effect of the HCl is also reflected in the spectrum of the treated specimens.

Ligand Influence Versus Electronic Configuration of d-metal Ion in Determining the Fate of NIR Emission from LnIII Ions: A Case Study with CuII, NiII and ZnII Complexes.

2021 ◽  
Author(s):  
Abhineet Verma ◽  
Sk Saddam Hossain ◽  
Sailaja S Sunkari ◽  
Joseph Reibenspies ◽  
Satyen Saha
Keyword(s):  
Metal Ion ◽  
Selection Rule ◽  
Near Infrared ◽  
Electronic Configuration ◽  
Infrared Region ◽  
Direct Excitation ◽  
Characteristic Emission ◽  
Nir Emission ◽  
Near Infrared Region

Lanthanides (LnIII) are well known for their characteristic emission in the Near-Infrared Region (NIR). However, direct excitation of lanthanides is not feasible as described by Laporte’s parity selection rule. Here,...

Highly luminescent InP-In(Zn)P/ZnSe/ZnS core/shell/shell colloidal quantum dots with tunable emission synthesized based on growth-doping

2021 ◽  
Author(s):  
Cong Shen ◽  
Yan Qing Zhu ◽  
Zixiao Li ◽  
Jingling Li ◽  
Hong Tao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Region ◽  
Colloidal Quantum Dots ◽  
High Quality ◽  
Promising Alternative ◽  
Lower Toxicity ◽  
Near Infrared Region ◽  
Inp Quantum Dots ◽  
Tunable Emission

InP quantum dots (QDs) are considered as the most promising alternative to Cd-based QDs with the lower toxicity and emission spectrum tunability ranging from visible to near-infrared region. Although high-quality...

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