Temperature dependence of refractive characteristics of optical plastics

Kasarova, Stefka N.; Sultanova, Nina G.; Nikolov, Ivan D.

doi:10.1088/1742-6596/253/1/012028

Cited by 46 publications

(32 citation statements)

References 3 publications

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“…The effect of temperature dependent average refractive index (<n>) is negligible. [31,32] At first, the decrease of n leads to narrower bandwidth and decreased Bragg reflection as observed. As the temperature approaches clearing point, T NI (110 o C), the bandwidth gets broadened and then vanished as the birefringence drops to zero (Figure S3).…”

Section: Introductionmentioning

confidence: 82%

Multistimuli‐Responsive Self‐Organized Liquid Crystal Bragg Gratings

Chen

Lee

Zhan

et al. 2019

Advanced Optical Materials

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A simple approach is described to fabricate an electrically-, thermally-and optically responsive polarization Bragg grating using a dual-frequency liquid crystal (LC) doped with a photosensitive azo-benzene chiral compound. Due to the employed dual-frequency LC, the Bragg reflection is switchable by an electric field. Based on the trans-cis isomerization of the azo-benzene chiral dopant, the reflection wavelength of the LC Bragg gratings can be tuned across the visible wavelength by UV exposure. Meanwhile, the temperature responsivity of LC Bragg gratings is also characterized. Good agreement between experiment and theory is obtained. The circular polarization selectivity and external field tunability of LC Bragg gratings enrich these multi-functional devices and pave the way towards novel smart electro-optical devices.

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Section: Introductionmentioning

confidence: 82%

Multistimuli‐Responsive Self‐Organized Liquid Crystal Bragg Gratings

Chen

Lee

Zhan

et al. 2019

Advanced Optical Materials

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“…It is worth mentioning that for the PMMA film used in this analysis, a fluctuation in the temperature of five degrees around the room temperature causes a shift in the film index by 8×10 −4 RIU [19, 20]. This fluctuation is within the detection limit of the BU‐SPR [10].…”

Section: Sensitivity Enhancement With Pmma Layermentioning

confidence: 99%

Enhancement of side‐coupled surface plasmon resonance sensitivity by application of polymethylmethacrylate thin polymer films

Amjad

Swargiary

Somarapalli

et al. 2020

Micro & Nano Letters

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Here the theoretical and experimental investigation for enhancing surface plasmon resonance (SPR) sensitivity in a side-coupled excitation system by the application of polymethylmethacrylate (PMMA) polymer thin films is presented. Proper selection of film materials, gold layer thicknesses d Au and SPR incident angle (θ SPR) resulted in the increased effective refractive index of the sensing region, and hence of the device sensitivity, and the dynamic detection range. This work demonstrates, by first-order approximations, a characterisation scheme of SPR chips with unknown gold layer thickness d Au and uncertainty in SPR incident angle. The scheme utilised fitting theoretical calculations to measured SPR responses while varying d Au and θ SPR in equations. Device sensitivity nearly doubled following application of thin PMMA thin films on gold surfaces when sensing water-chloroform mixtures as opposed to untreated surfaces that lacked a PMMA layer. The proposed work demonstrates a facilitative balance between theoretical expectations and experimental data to develop sensors for future applications.

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“…HC-Weiss 0290 and Unicrown materials are trademarks of spectacle glass types of Barberini [13] and Corning [14] companies, respectively. [15] 390 380 [16] -340 [17] 355 [12] 330 [13] 320 [14] 270 [9] The significant influence of temperature on refraction of polymers is demonstrated by the presented [18]. Thermal properties of plastics are rather different compared to glass and this fact should be carefully regarded in medical vision applications.…”

Section: Refractionmentioning

confidence: 99%

Optical properties of plastic materials for medical vision applications

Sultanova

Kasarova

Nikolov

2012

J. Phys.: Conf. Ser.

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Abstract. Several types of optical polymer materials suitable for ophthalmic or medical vision applications have been studied. We have measured refractive indices of studied plastics at various wavelengths in the visible and near-infrared spectral regions. Important optical characteristics as Abbe numbers, dispersion coefficients and curves, principal and relative partial dispersion have been evaluated. Calculated refractometric data at many laser emission wavelengths used for medical surgery, therapy and diagnostics is included. As an example of a medical vision application of plastics, optical design of a micro-triplet for use in disposable endoscopes is presented. IntroductionThe variety of medical applications of optical plastic materials expands in consumer optics as well as in high precision vision devices. Over 50 percent of all eyeglass lenses sold nowadays are made of organic polymers. Except in ophthalmology, many surgical and diagnostic instruments as laparoscopes, arthroscopes, cystoscopes, endoscopes, etc. apply plastic materials [1]. The use of polymer optics is found in a wide range of not only clinical vision applications such as digital cameras, fiber photonic elements and systems, microscopes, surgical head-mounted video displays, LCD projectors, videoconferencing devices and mobile imaging. The rapid development of microelectronics and semiconductor industries places high demands on the performance of the applied miniature optical elements. Improvements in polymer and integrated hybrid glass-polymer components and systems offer efficient and compact solutions to meet these demands [2].Optical polymers (OPs) have several key advantages over glasses as reduced weight and cost, high impact and shatter resistance and ability to integrate proper mechanical and optical features [1]. The injection-moulding process is very effective to reproduce not only spherical but sophisticated optical shapes such as aspheres, and other complex geometric surfaces or elements with noncircular apertures. Obviously, unique priority of polymers in medical applications is safety. The major drawbacks of plastic materials are that they have less scratch resistance and are more sensitive to environment changes such as temperature and humidity. Plastics lenses can be supplied with hard, anti-abrasion coatings with anti-static and hydrophobic properties, helping to maintain the transparency of the surfaces and making them easier to clean [3]. Broad thermal range functionality and better correction of aberrations of medical vision components and devices can be achieved by usage of hybrid glasspolymer optics. Incorporation of plastics and glass may result in low-cost, high-performance and high-

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Temperature dependence of refractive characteristics of optical plastics

Cited by 46 publications

References 3 publications

Multistimuli‐Responsive Self‐Organized Liquid Crystal Bragg Gratings

Multistimuli‐Responsive Self‐Organized Liquid Crystal Bragg Gratings

Enhancement of side‐coupled surface plasmon resonance sensitivity by application of polymethylmethacrylate thin polymer films

Optical properties of plastic materials for medical vision applications

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