Deep UV Formation of Long-Term Stable Optical Bragg Gratings in Epoxy Waveguides and Their Biomedical Sensing Potentials
| Autor: | Ralf Hellmann, Marieke Rüth, Bernhard Schmauss, Steffen Hessler, Horst-Dieter Lemke |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers Physics::Optics 02 engineering and technology TP1-1185 Grating medicine.disease_cause 01 natural sciences Biochemistry Article Analytical Chemistry law.invention rapid test Fiber Bragg grating law blood analysis medicine Humans Electrical and Electronic Engineering optical sensor Instrumentation refractive index sensing EpoCore excimer laser business.industry Lasers Chemical technology 010401 analytical chemistry 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics Selective surface 0104 chemical sciences Refractometry Full width at half maximum human serum albumin Bragg grating Optoelectronics ddc:620 0210 nano-technology business Waveguide Refractive index Ultraviolet |
| Zdroj: | Sensors, Vol 21, Iss 3868, p 3868 (2021) Sensors (Basel, Switzerland) Sensors Volume 21 Issue 11 |
| ISSN: | 1424-8220 |
| Popis: | In this article, we summarize our investigations on optimized 248 nm deep ultraviolet (UV) fabrication of highly stable epoxy polymer Bragg grating sensors and their application for biomedical purposes. Employing m-line spectroscopy, deep UV photosensitivity of cross-linked EpoCore thin films in terms of responding refractive index change is determined to a maximum of Δn = + (1.8 ± 0.2) × 10−3. All-polymer waveguide Bragg gratings are fabricated by direct laser irradiation of lithographic EpoCore strip waveguides on compatible Topas 6017 substrates through standard +1/-1-order phase masks. According near-field simulations of realistic non-ideal phase masks provide insight into UV dose-dependent characteristics of the Bragg grating formation. By means of online monitoring, arising Bragg reflections during grating inscription via beforehand fiber-coupled waveguide samples, an optimum laser parameter set for well-detectable sensor reflection peaks in respect of peak strength, full width at half maximum and grating attenuation are derived. Promising blood analysis applications of optimized epoxy-based Bragg grating sensors are demonstrated in terms of bulk refractive index sensing of whole blood and selective surface refractive index sensing of human serum albumin. |
| Databáze: | OpenAIRE |
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