Light-Sensitive Media-Composites for Recording Volume Holograms Based on Porous Glass and Polymer

Andreeva, O. V.; Bandyuk, O. V.

doi:10.5772/22373

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…Nanoporous silica (NPS) glass is another class of nanoporous substrates. They can be fabricated with tight control over the optical properties as well as the mechanical properties such as the porosity (linked to the pore size) and thickness [93]- [95]. They have been used to create substrates for recording holograms and also for point-of-care diagnosis of non-small cell lung cancer [94], [96].…”

Section: E) Cellulose Membrane Substratementioning

confidence: 99%

“…Nanoporous silica (NPS) glass substrates were acquired from the Department of Photonics and Optical Information Technology, ITMO, St. Petersburg, Russia. NPS glass substrates were made from glass which had a composition of Na2O -6.2%; B203 -25.1%; SiO2 -67.8% [93]. The glass had a chemically unstable borate phase intertwined with a chemically stable silica phase.…”

Section: Fabrication -Nanoporous Substratesmentioning

confidence: 99%

“…The pores did not have any specific orientation and the depths obtained with AFM do not truly represent the pore depths for both the substrates. The sizes of the pores were obtained from the manufacturers [93]. The pore size estimated using the methods were used to label the substrates as NS-7 (for 7 nm pores) and NS-17 (for 17 nm pores).…”

Section: Fiber Nsl Substratesmentioning

confidence: 99%

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Fibre Optic SERS Probes For Remote Sensing

Pandya¹

2021

Preprint

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Surface Enhanced Raman Spectroscopy (SERS) enhances spontaneous Raman spectroscopy by the virtue of plasmon resonance of nanoparticles. Clinical application of SERS is challenging as nanoparticles remain in the body for long periods of time and a full toxicity analysis has yet to be extensively studied. In this study, Nanosphere lithography (NSL) was used to create optical fibers with nanoparticle enhanced tips for remote sensing using SERS. A custom designed RS collection setup was created for optimal collection of spectra from the optical fibers. It was found that an optical fiber with 0.5 numerical aperture (NA) allowed for better detection of Raman peaks while mitigating the fluorescence background of the optical fiber without any optical filters. Such a sensing platform can potentially be used to temporarily introduce nanoparticles into a sensing environment as it allows retracting the nanoparticles along with the tip. Nanoporous SERS platform has been fabricated using nanoporous silica glass with 7 nm and 17 nm pore diameters. An inexpensive fabrication approach of sputter deposition of Au layers was employed on prefabricated nanoporous silica glasses. 7 nm pore glasses provided larger enhancement than the glasses with 17 nm pores. A gold layer thickness of 25 nm was observed to produce largest enhancements. Nanoporous SERS substrates allow a larger effective SERS area compared to NSL based fabrication substrates and such nanoporous structures can be potentially fabricated on optical fiber tips for remote sensing. Finite Element Modeling (FEM) method was implemented for simulating single nanoparticles, an infinite periodic array of nanoparticles and nanoporous films using COMSOL Multiphysics software package. The extinction spectra obtained theoretically were found to match the experimental results for single nanoparticles. The maximum enhancement for the periodic array was two orders of magnitude larger than single particles while the integrated (average) enhancement was only two and a half times larger. Nanoporous films were also modelled using the FEM technique. Preliminary clinical data were collected from excised breast tissues for evaluating RS as a tool for cancer diagnostics. Spectral peaks from healthy tissues were found to be prominent than cancerous tissues and further experiments are needed to create a multivariate classification model for diagnostics.

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Section: E) Cellulose Membrane Substratementioning

confidence: 99%

Section: Fabrication -Nanoporous Substratesmentioning

confidence: 99%

Section: Fiber Nsl Substratesmentioning

confidence: 99%

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Fibre Optic SERS Probes For Remote Sensing

Pandya¹

2021

Preprint

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“…Samples were prepared in the shape of plane-parallel disks, 40 mm in diameter and thickness (2÷4) mm [3]. The using radiation with wavelength λ=473 nm is located in the region of absorption of PQ and presents by itself a beam of radiation of solid state DPSS laser which is (2.5÷3.0) mm in diameter and its power is of about 50 mWt.…”

mentioning

confidence: 99%

Evaluation of thermal exposure on absorbing objects with digital holographic interferometry method

et al. 2014

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The digital holographic interferometry methods that are used in this work nowadays is widely applied to research of temporal dynamics of objects transformation in different processes [1,2]. Authors use developed stand and software that are used for detecting and controlling of phase changes of transparent objects with time resolution not less than 100 ms for a long time.Samples of recording polymer material for volume holography «Difphen», solid solution of organic dye phenanthrenequinone (PQ) in polymethylmethacrylate (PMMA), were used as an object of research. Samples were prepared in the shape of plane-parallel disks, 40 mm in diameter and thickness (2÷4) mm [3]. The using radiation with wavelength λ=473 nm is located in the region of absorption of PQ and presents by itself a beam of radiation of solid state DPSS laser which is (2.5÷3.0) mm in diameter and its power is of about 50 mWt. The part of the sample that was exposed by the radiation, absorbing energy, is bleaching and heating up. The bleaching process takes place just in localized area (exposed area), while increase of temperature from exposed area to unexposed areas of the sample is spread by heat transfer.For observation of the process of transfer of heat in the quality of probe radiation we use radiation with wavelength λ = 532 nm in spectral area of light-insensitivity the sample. The probe area was 20x20 mm, which allowed us to evaluate thermal effects in object's area, located out of reach of laser beam 473nm.

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