Robust polarization active nanostructured 1D Bragg Microcavities as optofluidic label-free refractive index sensor

Oliva-Ramirez, Manuel; Gil-Rostra, Jorge; Yubero, F.; González‐Elipe, Agustín R.

doi:10.1016/j.snb.2017.10.060

Cited by 14 publications

(14 citation statements)

References 43 publications

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“…This reference spectrum depicts the typical wide reflectance gap and resonance peak of this type of 1D photonic structure (blue line in Figure 1(d)). As reported in previous works [36][37][38], this resonant peak at around 460 nm can be used to monitor changes in the BM when it is liquid-infiltrated. The reflectance spectrum recorded for the BM deposited onto the EMF chip depicts a similar spectrum where the resonant peak was less well defined and appeared slightly shifted to shorter wavelengths (red line in Figure 1(d)).…”

Section: Optical Monitoring Of the Bm-electrodementioning

confidence: 55%

“…Figure 2 presents the optofluidic characterization of the BM-electrode when delivering the liquids directly onto the BM with a pipette. Dripping liquids onto this zone should fill the pores of the BM and, according to previous analysis, would induce changes in the optical response of the BM transducer [36][37][38], Effectively, Figure 2(a) shows that the infiltration with different liquids led to a shift of the optical spectra to larger wavelengths (i.e., a redshift), that in the case of mineral oil reached up to 21 nm. The representation of the magnitude of these shifts as a function of the refractive index of the infiltrating liquid in Figure 2(b) shows a clear dependence that can be used to differentiate a specific liquid from others with different refractive index.…”

Section: Optical Monitoring Of the Bm-electrodementioning

confidence: 77%

“…The procedure relies on a recently reported results about the manufacturing by physical vapor oblique angle deposition (PV-OAD) [36][37][38] of porous multilayers in the form of Bragg Microcavities (BMs). This system consists of the successive stacking of porous layers of two transparent materials with different refractive indices and was successfully tested for the detection of glucose solutions.…”

Section: Introductionmentioning

confidence: 99%

“…Due to light interference processes, the optical spectra of these multilayers present a resonant peak in the middle of a band gap that can be used for monitoring the refractive index of liquids or solutions filling the pores. An outstanding characteristic of these porous BMs as optofluidic sensor device is their capacity to monitor very low analyte volumes (~1 nL) [36][37][38]. The present work constitutes an attempt to combine in a single chip system with an EMF device for handling small droplets of liquids and with a porous BM chip, thus providing the double capacity of moving liquids at the microscale and proceeding to their RI analysis.…”

Section: Introductionmentioning

confidence: 99%

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Optofluidic liquid sensing on electromicrofluidic devices

Oliva-Ramirez

Wang

Rico

et al. 2020

Mater. Res. Express

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Electromicrofluidic (EMF) devices are used to handle and move tiny amounts of liquids by electrical actuation, including electrowetting-on-dielectric (EWOD) and dielectrophoresis (DEP). Monitoring the liquid characteristics in one of these devices requires suitable sensing transducers incorporated within the microfluidic structure. In the present work, we describe the incorporation of an optofluidic photonic transducer in an EMF device to monitor the refractive index of a liquid during its manipulation. The incorporated transducer consists of a responsive porous Bragg Microcavity (BM) deposited via physical vapor oblique angle deposition. Besides reporting the manufacturing procedure of the sensing-EMF device combining liquid handling and monitoring, the performance of the BM is verified by infiltrating several liquids dripped on its surface and comparing the responses with those of liquid droplets electrically moved from the delivery part of the chip to the BM location. This study proved that modified EMF devices can incorporate photonic structures to analyze very low liquid volumes (∼0.2 μL) during its handling.

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Section: Optical Monitoring Of the Bm-electrodementioning

confidence: 55%

Section: Optical Monitoring Of the Bm-electrodementioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optofluidic liquid sensing on electromicrofluidic devices

Oliva-Ramirez

Wang

Rico

et al. 2020

Mater. Res. Express

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“…Besides, there should be space in the Bragg reflectors and the cavity to be fulfilled with fluid or biosample for the detection. This can be done clearly with porous materials, for example with porous silicon controlling the size of the pore, matching the values of the refractive index to build a working Bragg reflector, reaching a limit of detection in the order of 10 −7 RIU [32], or with a similar approach using porous SiO 2 and TiO 2 layers [33].…”

Section: Vertical Sensorsmentioning

confidence: 99%

Engineering vertically interrogated interferometric sensors for optical label-free biosensing

et al. 2020

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In this work, we review the technology of vertically interrogated optical biosensors from the point of view of engineering. Vertical sensors present several advantages in the fabrication processes and in the light coupling systems, compared with other interferometric sensors. Four different interrelated aspects of the design are identified and described: sensing cell design, optical techniques used in the interrogation, fabrication processes, fluidics, and biofunctionalization of the sensing surface. The designer of a vertical sensor should decide carefully which solution to adopt on each aspect to finally integrating all the components in a single platform. Complexity, cost, and reliability of this platform will be determined by the decisions taken on each of the design process. We focus in the research and experience acquired by our group during last years on the field of optical biosensors.

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SiOx by magnetron sputtered revisited: Tailoring the photonic properties of multilayers

García-Valenzuela

Álvarez

Espinós

et al. 2019

Applied Surface Science

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Traditionally porous silicon based photonic structures have been prepared by electrochemically etching of silicon. In this work, porous multilayers of nanocolumnar SiOx and SiO2 thin films acting as near infrared (NIR) 1D-photonic nanostructures are prepared by magnetron sputtering deposition at oblique angles (MS-OA). Simultaneous control of porosity and stoichiometry of the stacked films is achieved by adjusting the deposition angle and oxygen partial pressure according to a parametric formula. This new methodologoy is proved for the synthesis of SiOx thin films with x close to 0.4, 0.8, 1.2, 1.6 and nanostructures varying from compact (at 0° deposition angle) to highly porous and nanocolumnar (at 70º and 85° deposition angles). The strict control of composition, structure and nanostructure provided by this technique permits a fine tuning of the absorption edge and refraction index at 1500 nm of the porous films and their manufacturing in the form of SiOx-SiO 2 porous multilayers acting as near infrared (NIR) ACCEPTED MANUSCRIPTRecently, SiO x nanowires have been proposed as refractive index sensing devices, [10] while in the form of stacked layers and porous films this material is utilized for the fabrication of Li battery electrodes. [11,12] Compact SiO x thin films have been fabricated by various methods, including evaporation [13][14][15] thermal chemical vapor deposition (CVD), [16,17] or magnetron sputtering (MS).[18-20] Radio frequency reactive MS was profusely utilized by Habraken et al. for the deposition of SiOx thin films.[21-26] Besides

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Robust polarization active nanostructured 1D Bragg Microcavities as optofluidic label-free refractive index sensor

Cited by 14 publications

References 43 publications

Optofluidic liquid sensing on electromicrofluidic devices

Optofluidic liquid sensing on electromicrofluidic devices

Engineering vertically interrogated interferometric sensors for optical label-free biosensing

SiOx by magnetron sputtered revisited: Tailoring the photonic properties of multilayers

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