Fabrication of Ge-ZnS multilayered optical filters for mid-infrared applications

Duris, Maxime; Deubel, Damien; Bodiou, Loïc; Vaudry, C.; Keromnès, Jean-Claude; Charrier, Joël

doi:10.1016/j.tsf.2020.138488

Cited by 18 publications

(7 citation statements)

References 39 publications

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“…It is composed of alternating layers of different materials with different refractive indices. 94 The common semiconducting materials applied include metalloids, such as arsenic (As), silicon (Si), germanium (Ge), antimony (Sb), and tellurium (Te); post-transition metals, such as aluminum (Al), gallium (Ga), indium (In), and tin (Sn); and sometimes reactive nonmetals, such as selenium (Se), bromine (Br), and iodine(I). IR interference filters can be fabricated using various methods, such as vacuum deposition, sputtering, and ion-assisted deposition, which has been recently reviewed by Lochbaum et al 89 The thickness of each layer is carefully designed to create a specific interference pattern that selectively enhances the transmission of the desired wavelength range and reduces the transmission of other wavelengths.…”

Section: ■ Infrared Sensorsmentioning

confidence: 99%

Review and Perspective: Gas Separation and Discrimination Technologies for Current Gas Sensors in Environmental Applications

et al. 2023

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Presently, numerous state-of-the-art approaches are being adapted for gas sensing and monitoring. These include hazardous gas leak detection as well as ambient air monitoring. Photoionization detectors, electrochemical sensors, and optical infrared sensors are a few of the commonly widely used technologies. Extensive reviews on the current state of gas sensors have been summarized. These sensors, which are either nonselective or semiselective, are affected by unwanted analytes. On the other hand, volatile organic compounds (VOCs) can be heavily mixed in many vapor intrusion situations. To determine the individual VOCs in a highly mixed gas sample using nonselective or semiselective gas sensors, gas separation and discrimination technologies are highly warranted. These technologies include gas permeable membranes, metal–organic frameworks, microfluidics and IR bandpass filters for different sensors, respectively. The majority of these gas separation and discrimination technologies are currently being developed and evaluated in laboratory-controlled environments and have not yet been extensively utilized in the field for vapor intrusion monitoring. These technologies show promise for continued development and application in the field for more complex gas mixtures. Hence, the present review focuses on the perspectives and a summary of the existing gas separation and discrimination technologies for the currently popular reported gas sensors in environmental applications.

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Section: ■ Infrared Sensorsmentioning

confidence: 99%

Review and Perspective: Gas Separation and Discrimination Technologies for Current Gas Sensors in Environmental Applications

et al. 2023

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“…As is shown in the 3D stereogram, in the same figure, the bio-chip is made of stacks of ZnS/Ge alternating layers, placed at two sides of the bio-cell, which were filled/emptied through nanofluidic channels. It is worth noting that deposition of Ge layers on ZnS slabs has been already performed successfully in experiments [24,25]. It has been shown that, when controlling the deposition time, it is possible to control the layer's thickness [26].…”

Section: Geometrical Structure and Involved Partsmentioning

confidence: 99%

Novel Photonic Bio-Chip Sensor Based on Strained Graphene Sheets for Blood Cell Sorting

Ghasemi

Razi

2021

Molecules

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A photonic biochip with a tunable response in the visible range is suggested for blood cell sorting applications. Multi-layers of ZnS and Ge slabs (as the main building blocks), hosting a cell in which bio-sample could be injected, are considered as the core of the sensor. In order to increase the sensitivity of the chip, the bio-cell is capsulated inside air slabs, and its walls are coated with graphene sheets. Paying special attention to white and red blood components, the optimum values for structural parameters are extracted first. Tunability of the sensor detectivity is then explored by finding the role of the probe light incident angle, as well as its polarization. The strain of the graphene layer and angle in which it is applied are also suggested to further improve the performance tunability. Results reflect that the biochip can effectively identify selected components through their induced different optical features, besides of the different figure of merit and sensitivity amounts that are recorded for them by the sensor.

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“…In refnement, a starting design is provided, which has a spectrum that is a close approximation of the desired spectrum; whereas, in synthesis, no such design is defned. Given a suitable starting design, the refnement method gradually modifes the construction parameters to minimize a merit function defning the quality of the design [17,18]. Te merit function is determined by defning targets at a single or a range of wavelengths.…”

Section: Introductionmentioning

confidence: 99%

“…Tis method generates coatings with a continuously varying refractive index profle which can be transformed into twomaterial multilayer systems using an extra step. Te latter is usually subjected to further refnement, see references [18,19]. (2) In the needle synthesis method, the thicknesses are varied to alter the phase relationship among the refected waves during the optimization process.…”

Section: Introductionmentioning

confidence: 99%

Continuously Varying Thickness Interference Bandpass Filter for the Visible Spectral Range: Using Ion Beam Sputter Deposition

Ullah

Amirzada

Jahan

et al. 2022

Advances in Materials Science and Engineering

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Optical bandpass filters, used to restrict certain wavelengths while allowing other wavelengths to pass, are a common element in many optical devices, such as spectroscopic sensors and hyperspectral imagers. Such filters can be implemented using interference filters, which operate on the principle of constructive and destructive interference. In this work, an interference bandpass filter with continuously varying thicknesses of the constituent films is designed and fabricated for the visible spectral range. Niobium pentoxide and silicon dioxide are used as the filter materials due to the high refractive index contrast between them, resulting in a smaller number of required material films. Ion beam sputter deposition is used as the deposition method due to its ability to produce accurate thickness high optical quality films. The fabricated filter has a transmission band of 130 nm, i.e., 470–600 nm, and can block wavelengths as low as 300 nm and as high as 1080 nm, which is sufficient for use with silicon-based detectors in the visible spectral range. The maximum and minimum transmission inside the transmission band is 96% and 71%, respectively, with an average transmission of 88%. The transmission outside the transmission band is less than 1.6%.

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Fabrication of Ge-ZnS multilayered optical filters for mid-infrared applications

Cited by 18 publications

References 39 publications

Review and Perspective: Gas Separation and Discrimination Technologies for Current Gas Sensors in Environmental Applications

Review and Perspective: Gas Separation and Discrimination Technologies for Current Gas Sensors in Environmental Applications

Novel Photonic Bio-Chip Sensor Based on Strained Graphene Sheets for Blood Cell Sorting

Continuously Varying Thickness Interference Bandpass Filter for the Visible Spectral Range: Using Ion Beam Sputter Deposition

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