scholarly journals Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hwa-Seub Lee ◽  
Gyu-Weon Hwang ◽  
Tae-Yeon Seong ◽  
Jongkil Park ◽  
Jae Wook Kim ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Filter Design ◽  
Reconstruction Technique ◽  
Filter Function ◽  
Promising Alternative ◽  
Mid Infrared ◽  
Spectrum Reconstruction ◽  
Filter Array ◽  
On Chip ◽  
Multispectral Filter Array

AbstractMid-infrared wavelengths are called the molecular fingerprint region because it contains the fundamental vibrational modes inherent to the substances of interest. Since the mid-infrared spectrum can provide non-destructive identification and quantitative analysis of unknown substances, miniaturized mid-infrared spectrometers for on-site diagnosis have attained great concern. Filter-array based on-chip spectrometer has been regarded as a promising alternative. In this study, we explore a way of applying a pillar-type plasmonic nanodiscs array, which is advantageous not only for excellent tunability of resonance wavelength but also for 2-dimensional integration through a single layer process, to the multispectral filter array for the on-chip spectrometer. We theoretically and experimentally investigated the optical properties of multi-periodic triangular lattices of metal nanodiscs array that act as stopband filters in the mid-infrared region. Soft-mold reverse nanoimprint lithography with a subsequent lift-off process was employed to fabricate the multispectral filter array and its filter function was successfully extracted using a Fourier transform infrared microscope. With the measured filter function, we tested the feasibility of target spectrum reconstruction using a Tikhonov regularization method for an ill-posed linear problem and evaluated its applicability to the infrared spectroscopic sensor that monitors an oil condition. These results not only verify that the multispectral filter array composed of stopband filters based on the metal nanodiscs array when combined with the spectrum reconstruction technique, has great potential for use to a miniaturized mid-infrared on-chip spectrometer, but also provide effective guidance for the filter design.

scholarly journals Towards lab-on-chip ultrasensitive ethanol detection using photonic crystal waveguide operating in the mid infrared

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Rostamian ◽  
Ehsan Madadi-Kandjani ◽  
Hamed Dalir ◽  
Volker J. Sorger ◽  
Ray T. Chen
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
High Sensitivity ◽  
Guided Wave ◽  
Silicon On Insulator ◽  
Group Index ◽  
Photonic Crystal Waveguide ◽  
Mid Infrared ◽  
Lab On Chip ◽  
On Chip

Abstract Thanks to the unique molecular fingerprints in the mid-infrared spectral region, absorption spectroscopy in this regime has attracted widespread attention in recent years. Contrary to commercially available infrared spectrometers, which are limited by being bulky and cost-intensive, laboratory-on-chip infrared spectrometers can offer sensor advancements including raw sensing performance in addition to use such as enhanced portability. Several platforms have been proposed in the past for on-chip ethanol detection. However, selective sensing with high sensitivity at room temperature has remained a challenge. Here, we experimentally demonstrate an on-chip ethyl alcohol sensor based on a holey photonic crystal waveguide on silicon on insulator-based photonics sensing platform offering an enhanced photoabsorption thus improving sensitivity. This is achieved by designing and engineering an optical slow-light mode with a high group-index of n g  = 73 and a strong localization of modal power in analyte, enabled by the photonic crystal waveguide structure. This approach includes a codesign paradigm that uniquely features an increased effective path length traversed by the guided wave through the to-be-sensed gas analyte. This PIC-based lab-on-chip sensor is exemplary, spectrally designed to operate at the center wavelength of 3.4 μm to match the peak absorbance for ethanol. However, the slow-light enhancement concept is universal offering to cover a wide design-window and spectral ranges towards sensing a plurality of gas species. Using the holey photonic crystal waveguide, we demonstrate the capability of achieving parts per billion levels of gas detection precision. High sensitivity combined with tailorable spectral range along with a compact form-factor enables a new class of portable photonic sensor platforms when combined with integrated with quantum cascade laser and detectors.

scholarly journals Plasmonic Mid-Infrared Filter Array-Detector Array Chemical Classifier Based on Machine Learning

ACS Photonics ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 648-657
Author(s):  
Jiajun Meng ◽  
Jasper J. Cadusch ◽  
Kenneth B. Crozier
Keyword(s):  
Machine Learning ◽  
Detector Array ◽  
Array Detector ◽  
Mid Infrared ◽  
Filter Array

Quality metric for filter arrangement in a multispectral filter array

2013 ◽  
Author(s):  
Kazuma Shinoda ◽  
Taisuke Hamasaki ◽  
Madoka Hasegawa ◽  
Shigeo Kato ◽  
Antonio Ortega
Keyword(s):  
Quality Metric ◽  
Filter Array ◽  
Filter Arrangement ◽  
Multispectral Filter Array

scholarly journals Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission

2019 ◽  
Vol 9 (11) ◽  
pp. 2351 ◽  
Author(s):  
Da Teng ◽  
Kai Wang ◽  
Zhe Li ◽  
Yongzhe Zhao ◽  
Gao Zhao ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Infrared Range ◽  
Support Surface ◽  
Low Loss ◽  
Propagation Length ◽  
Promising Alternative ◽  
Mid Infrared ◽  
Terahertz Transmission ◽  
Mode Area ◽  
Thz Waves

Graphene has been recently proposed as a promising alternative to support surface plasmons with its superior performances in terahertz and mid-infrared range. Here, we propose a graphene-coated elliptical nanowire (GCENW) structure for subwavelength terahertz waveguiding. The mode properties and their dependence on frequency, nanowire size, permittivity and chemical potential of graphene are studied in detail by using a finite element method, they are also compared with the graphene-coated circular nanowires (GCCNWs). Results showed that the ratio of the long and short axes (b/a) of the elliptical nanowire had significant influence on mode properties, they also showed that a propagation length over 200 μm and a normalized mode area of approximately 10−4~10−3 could be obtained. Increasing b/a could simultaneously achieve both long propagation length and very small full width at half maximum (FWHM) of the focal spots. When b/a = 10, a pair of focal spots about 40 nm could be obtained. Results also showed that the GCENW had a better waveguiding performance when compared with the corresponding GCCNWs. The manipulation of Terahertz (THz) waves at a subwavelength scale using graphene plasmon (GP) may lead to applications in tunable THz components, imaging, and nanophotonics.

Irradiation of on-chip chalcogenide glass waveguide mid-infrared gas sensor

2016 ◽  
Author(s):  
Peter Su ◽  
Zhaohong Han ◽  
Derek Kita ◽  
Vivek Singh ◽  
Qingyang Du ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Chalcogenide Glass ◽  
Mid Infrared ◽  
Glass Waveguide ◽  
On Chip

Novel Designs for On-chip Mid-Infrared Detectors Integrated with Chalcogenide Waveguides

2011 ◽  
Author(s):  
Vivek Singh ◽  
Juejun Hu ◽  
Timothy Zens ◽  
Jianfei Wang ◽  
Pao Tai Lin ◽  
...  
Keyword(s):  
Infrared Detectors ◽  
Mid Infrared ◽  
On Chip

Filter Design for Diagonal Stripe Patterned Color Filter Array

2013 ◽  
Vol 718-720 ◽  
pp. 2370-2375 ◽  
Author(s):  
Gwang Gil Jeon
Keyword(s):  
Filter Design ◽  
Visual Quality ◽  
Color Filter ◽  
Color Filter Array ◽  
Filter Array ◽  
Objective Performance ◽  
Color Interpolation ◽  
Simulation Results ◽  
Visual Assessments

An issue of diagonal stripe patterned color filter array (CFA) is introduced in this paper. This is a procedure known as color interpolation, aka demosaicking. Both of objective and visual assessments are researched, and the simulation results are shown in the paper. It was found that our proposed filter yields good objective performance with excellent visual quality.

Sign in / Sign up

Export Citation Format

Share Document