An Arrayed Liquid Crystal Fabry–Perot Infrared Filter for Electrically Tunable Spectral Imaging Detection

Lin, Jiuning; Tong, Qing; Lei, Yu; Xin, Zhaowei; Zhang, Xinyu; J, An; Sang, Hongshi; Xie, Changsheng

doi:10.1109/jsen.2016.2521000

Cited by 12 publications

(7 citation statements)

References 18 publications

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“…The NPs were well dispersed in the PI solution due to the organic alkyl chains of stearic acid. The prepared PI mixtures of each ratio were coated on the ITO substrates and then thermally cured at 200 °C for 1 h. Thus, the functional hybrid PI alignment layer with a thickness of approximately 100 nm was prepared [ 28 , 29 ].…”

Section: Methodsmentioning

confidence: 99%

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

Son

Choi

et al. 2021

Polymers

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Construction of liquid crystal (LC) alignment by introducing polyimide (PI) to indium tin oxide (ITO) electrodes is one of the main methods to realize high-resolution images in liquid crystal displays (LCD). However, the loss of transmittance caused by the difference in refractive index between ITO and PI leads to direct degradation of LCD performance. Thus, we herein fabricated a functional hybrid PI alignment layer that reduces the difference in refractive index and greatly increases the transmittance of the device by introducing inorganic titanium dioxide (TiO2) nanoparticles (NP) to the organic PI. The highly refractive TiO2 NPs were surface-treated with stearic acid comprising long alkyl chains to improve their dispersibility and uniformly dispersed in the PI matrix by simply stirring the mixture. The hybrid PI mixture was spin-coated on the ITO substrate, and the resulting LC cell exhibited excellent electro-optical properties. In addition, the reliability of the LC cells was enhanced by the inclusion of the TiO2 NPs, which was confirmed through the evaluation of voltage holding ratio, residual direct current, and LC cell reliability. Overall, functional hybrid PI can be used in advanced display technology for next-generation LC devices that require high transmittance and reliability.

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Section: Methodsmentioning

confidence: 99%

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

Son

Choi

et al. 2021

Polymers

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“…In several previous works, electrical tuning of the transmittance spectrum of FPIs is achieved by the virtue of the electro-optic and/or piezoelectric effects -through the use of liquid crystals, silicon-based on-chip design, hybrid sol-gel methods, etc. [20][21][22][23][24][25]. Besides, there have been a few reports on micro-machined MEMS (micro-electromechanical system)-based FPIs, but those structures require expensive and complicated topdown fabrication procedures; moreover, some of them involve relatively large potentials (up to several tens of volts) for tuning the transmitted light wavelength [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

An electro-tunable Fabry–Perot interferometer based on dual mirror-on-mirror nanoplasmonic metamaterials

Sikdar

Kornyshev

2019

Nanophotonics

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Mirror-on-mirror nanoplasmonic metamaterials, formed on the basis of voltage-controlled reversible self-assembly of sub-wavelength-sized metallic nanoparticles (NPs) on thin metallic film electrodes, are promising candidates for novel electro-tunable optical devices. Here, we present a new design of electro-tunable Fabry–Perot interferometers (FPIs) in which two parallel mirrors – each composed of a monolayer of NPs self-assembled on a thin metallic electrode – form an optical cavity, which is filled with an aqueous solution. The reflectivity of the cavity mirrors can be electrically adjusted, simultaneously or separately, via a small variation of the electrode potentials, which would alter the inter-NP separation in the monolayers. To investigate optical transmittance from the proposed FPI device, we develop a nine-layer-stack theoretical model, based on our effective medium theory and multi-layer Fresnel reflection scheme, which produces excellent match when verified against full-wave simulations. We show that strong plasmonic coupling among silver NPs forming a monolayer on a thin silver-film substrate makes reflectivity of each cavity mirror highly sensitive to the inter-NP separation. Such a design allows the continuous tuning of the multiple narrow and intense transmission peaks emerging from an FPI cavity via electro-tuning the inter-NP separation in situ – reaping the benefits from both inexpensive bottom-up fabrication and energy-efficient tuning.

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“…Such snapshot approaches typically use sophisticated detectors to acquire spectral data cubes quickly . Of these, the Fabry‐Perot interferometer takes advantage of parallel reflective mirrors to preferentially select wavelengths of interest and quickly acquire spectral data cubes . A final approach relies on a band sequential method of scanning each wavelength of the fluorescence emission, typically through widely available tunable filter technologies that can rapidly move through a range of wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Label‐free spectroscopic tissue characterization using fluorescence excitation‐scanning spectral imaging

Favreau

Deal

Harris

et al. 2019

Journal of Biophotonics

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A false‐colored and merged image of fresh, ex vivo rat kidney acquired using an excitation‐scanning hyperspectral imaging system. The spectral image was acquired using excitation wavelengths from 360 to 550 nm. Colors represent principal components extracted from a spectral image cube featuring no added labels or markers. Further details can be found in the article by Peter F. Favreau, Joshua A. Deal, Bradley Harris, et al. (https://onlinelibrary.wiley.com/doi/10.1002/jbio.201900183).

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An Arrayed Liquid Crystal Fabry–Perot Infrared Filter for Electrically Tunable Spectral Imaging Detection

Cited by 12 publications

References 18 publications

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

An electro-tunable Fabry–Perot interferometer based on dual mirror-on-mirror nanoplasmonic metamaterials

Label‐free spectroscopic tissue characterization using fluorescence excitation‐scanning spectral imaging

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