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- Dev Choudhury, Bikash, et al.
(author)
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Silicon nanopillar arrays with SiO2 overlayer for biosensing application
- 2014
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In: Optical Materials Express. - 2159-3930 .- 2159-3930. ; 4:7, s. 1345-1354
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Journal article (peer-reviewed)abstract
- We present the fabrication of silicon dioxide (SiO2) coated silicon nanopillar array structures and demonstrate their application as sensitive optical biosensors. Colloidal lithography, plasma dry etching and deposition processes are used to fabricate SiO2 coated Si nanopillar arrays with two different diameters and periods. Proof of concept bio recognition experiments are carried out with the bovine serum albumin (BSA)/antiBSA model system using Fourier transform visible and IR spectrometry (FT-VIS-IR) in reflection mode. A limit of detection (LoD) value of 5.2 ng/ml is estimated taking in to account the wavenumber uncertainty in the measurements.
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| 4. |
- Aparicio, Francisco J., et al.
(author)
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Dye-based photonic sensing systems
- 2016
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In: Sensors and actuators. B, Chemical. - : Elsevier. - 0925-4005 .- 1873-3077. ; 228, s. 649-657
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Journal article (peer-reviewed)abstract
- We report on dye-based photonic sensing systems which are fabricated and packaged at wafer scale. For the first time luminescent organic nanocomposite thin-films deposited by plasma technology are integrated in photonic sensing systems as active sensing elements. The realized dye-based photonic sensors include an environmental NO2 sensor and a sunlight ultraviolet light (UV) A+B sensor. The luminescent signal from the nanocomposite thin-films responds to changes in the environment and is selectively filtered by a photonic structure consisting of a Fabry-Perot cavity. The sensors are fabricated and packaged at wafer-scale, which makes the technology viable for volume manufacturing. Prototype photonic sensor systems have been tested in real-world scenarios. (C) 2016 Elsevier B.V. All rights reserved.
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| 5. |
- Aparicio, Francisco J., et al.
(author)
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Transparent Nanometric Organic Luminescent Films as UV-Active Components in Photonic Structures
- 2011
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In: Advanced Materials. - : Wiley. - 0935-9648 .- 1521-4095. ; 23:6, s. 761-765
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Journal article (peer-reviewed)abstract
- A new kind of visible-blind organic thin-film material, consisting of a polymeric matrix with a high concentration of embedded 3-hydroxyflavone (3HF) dye molecules, that absorbs UV light and emits green light is presented. The thin films can be grown on sensitive substrates, including flexible polymers and paper. Their suitability as photonic active components in photonic devices is demonstrated.
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| 6. |
- Barrios, C. A., et al.
(author)
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Reconfiguration of microring resonators by liquid adhesion
- 2008
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In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 93:20
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Journal article (peer-reviewed)abstract
- We present a procedure to reconfigure microring resonators based on liquid surface adhesion. Droplets of organic solvents were deposited over Si3N4/SiO2 strip- and slot-waveguide ring resonators, and the transmission spectra were measured several hours after the evaporation of the droplets at room temperature. Our measurements show that the optical properties of the microrings are significantly modified by liquid adhered to the waveguides, persisting even 96 h after bulk evaporation. Liquid-solid interfacial forces slow down liquid evaporation at the nanoscale, enabling permanent photonic configurations. Rewriteability is achieved by removing the adhered liquid with heat.
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| 7. |
- Barrios, Carlos A., et al.
(author)
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Slot-waveguide biochemical sensor (vol 32, pg 2080, 2007)
- 2008
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In: Optics Letters. - : OPTICAL SOC AMER. - 0146-9592 .- 1539-4794. ; 33:21, s. 2554-2555
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Journal article (peer-reviewed)abstract
- The group index, instead of the effective index, is used to analyze the performance of a Si(3)N(4)-SiO(2) slot-waveguide microring refractive index sensor [Opt. Lett. 32, 3080 (2007)]. Assuming that the slot is fully filled with liquid, excellent agreement is found between experimental results and calculations.
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