Improving the uniformity of holographic recording using multi-layer photopolymer: Part II Experimental results

Malallah, Ra’ed; Li, Haoyu; Qi, Yue; Cassidy, Derek; Muniraj, Inbarasan; Al-Attar, Nebras; Sheridan, John T.

doi:10.1364/josaa.36.000334

Cited by 14 publications

(4 citation statements)

References 42 publications

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“…The reason for the similar results between the low output homecare whitening LED (0.02mW/cm 2 ) and high output of clinical whitening LED (44mW/cm 2 ) can be explained by wavelengths of photosensitizers. The wavelength of the homecare whitening LED (420 -540 nm) was similar to the erythrosine wavelength (440 -570nm)[19]. If the wavelength of a light source matches that of a photosensitizer, it can produce an effective photodynamic therapeutic effect, but even if the wavelengths do not match, blue LED alone produces antibiotic effects.…”

mentioning

confidence: 99%

Application of Teeth Whitening LED for Prevention of Dental Caries : Antimicrobial Photodynamic Therapy Approach

Park¹,

Park²,

Lee³

et al. 2020

THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY

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The present study is aimed to assess the effect of antimicrobial photodynamic therapy (aPDT) on Streptococcus mutans biofilm through teeth whitening light emitting diode (LED).Planktonic and dynamic biofilm state cultures of S. mutans were used. Erythrosine 20 μM/L was used as the photosensitizer. Irradiation was performed by exposing cultures to clinic and homecare whitening LEDs for 15 minutes. The viability was measured through Colony Forming Unit counts and confocal laser scanning microscopy.aPDT using whitening LEDs and erythrosine significantly decreased the CFU count of S. mutans compared to that in the control group. Dynamic biofilm group showed more resistant features to aPDT compared with planktonic state. Clinic and homecare whitening LED device showed similar antimicrobial effect. The whitening LED, which could irradiate the entire oral arch, showed a significant photodynamic effect on cariogenic S. mutans biofilm. aPDT mediated by erythrosine and LEDs used for teeth whitening exhibited promising antimicrobial activity. Abstract 70Corresponding author : Juhyun Lee

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mentioning

confidence: 99%

Application of Teeth Whitening LED for Prevention of Dental Caries : Antimicrobial Photodynamic Therapy Approach

Park¹,

Park²,

Lee³

et al. 2020

THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY

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“…Hence, we examined the angular selectivity of TI&EY/PMMA polymers with different EY doping ratios, as shown in Figure 7 . The full width at half-maximum (FWHM) is adopted to estimate the angular-multiplexing capacity of recording materials [ 37 ]. A smaller value of FWHM can contribute to a higher storage capacity by using angular-multiplexing technology.…”

Section: Resultsmentioning

confidence: 99%

Holographic Grating Enhancement Induced by a Dual-Photo-Initiator System in PMMA Substrate Polymers

Wang,

Sun,

Liu

2023

Polymers

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Polymer systems induced by the reaction between monomers and photo-initiators play a crucial role in the formation of volume-phase gratings. In this paper, we fabricated a dual-photo-initiator photopolymer by doping EY (Eosin Yellow) molecules into a TI (Titanocene, Irgacure 784@BASF) dispersed PMMA (poly-[methyl methacrylate]) substrate system, with the aim of promoting the diffusion and polymerization processes in volume holographic storage. The two-wave interference system is adopted to record a permanent grating structure in our materials. The temporal diffraction variations of photopolymerization (during the interference exposure) and dark diffusion (after the interference exposure) processes have been investigated and analyzed. Aiming to analyze the influence of EY doping ratios on holographic performances, some key parameters were examined in the experiment. We first measured the temporal evolution of diffraction efficiency, then an exponential fitting was adopted to obtain the response time. Finally, the angular selectivity was evaluated by the Bragg condition after holographic recording. Also, the temporal evolution of each component is described by the nonlocal polymerization-driven diffusion model with a dual-photo-initiator composition, theoretically. Furthermore, we experimentally achieved the holographic grating enhancement in both the dark diffusion and photopolymerization processes by doping appropriate EY concentrations, respectively. This work provides a foundation for the acceptability of TI&EY/PMMA polymers in further holographic storage research.

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“…In the literature, a variation of dye concentration in multilayer photopolymer was used to improve the uniformity in volume gratings [19]. Three dyes were combined in a single layer of photopolymer material for full color display holography [20].…”

Section: Diffraction Efficiencymentioning

confidence: 99%

Development and Testing of a Dual-Wavelength Sensitive Photopolymer Layer for Applications in Stacking of HOE Lenses

et al. 2021

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Diffractive optical elements (DOEs) have been in development for many years and are an exciting technology with the capability to re-direct light, using diffraction rather than refraction. Holographic Optical Elements (HOEs) are a subset of diffractive optical elements for which the photonic structure is created holographically, i.e., by recording a specific interference pattern in a suitable, photosensitive optical material. Volume HOEs are of particular interest for some applications because of their very high diffraction efficiency and single diffracted order; however, high dispersion and angular wavelength selectivity still present significant challenges. This paper explores a method for producing a compound DOE useful for situations where elements designed for two separate target wavelengths can be advantageously combined to achieve a highly efficient HOE with reduced dispersion. A photopolymer material consisting of two independently sensitized laminated layers is prepared and used in sequential holographic recording at two different wavelengths. The photonic structures recorded are investigated through examination of their diffraction peaks and comparison with the structure predicted by modeling. Finally, the device is illuminated with an expanded diverging beam at both target wavelengths and with white light, and a strong diffracted beam is observed.

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Improving the uniformity of holographic recording using multi-layer photopolymer: Part II Experimental results

Cited by 14 publications

References 42 publications

Application of Teeth Whitening LED for Prevention of Dental Caries : Antimicrobial Photodynamic Therapy Approach

Application of Teeth Whitening LED for Prevention of Dental Caries : Antimicrobial Photodynamic Therapy Approach

Holographic Grating Enhancement Induced by a Dual-Photo-Initiator System in PMMA Substrate Polymers

Development and Testing of a Dual-Wavelength Sensitive Photopolymer Layer for Applications in Stacking of HOE Lenses

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