Effect of mechanical stress on optical properties of polydimethylsiloxane II – Birefringence

Tarjányi, Norbert; Turek, Ivan; Martinček, Ivan

doi:10.1016/j.optmat.2014.09.010

Cited by 19 publications

(5 citation statements)

References 11 publications

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“…These data correspond to a weight sensitivity of ∼18.3 pm∕g (51.2 pm/ kPa) which is higher than most of the reported optical fiber weight sensors, such as interferometer-based sensors [26] and fiber Bragg grating (FBG)-based sensors [27]. The resonant wavelength shift is mostly caused by the change of polarization and the photoelasticity of PDMS [28]. The resonant wavelength shift will naturally induce the output light power change for a certain light wavelength.…”

mentioning

confidence: 67%

Versatile hybrid plasmonic microfiber knot resonator

Chen

Yan

et al. 2017

Opt. Lett.

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A planar, all-optical fiber polarizer-based device based on a hybrid plasmonic microfiber knot resonator (HPMKR) is demonstrated in this Letter. A microfiber knot resonator (MKR) can be flexibly attached to the gold film, which forms the hybrid plasmonic mode with high propagation loss. Therefore, the device can be used not only as a broadband polarizer, but also as a high-quality resonator by tuning the geometry of the MKR. The polarizer has an extinction ratio of more than 15 dB ranging from 1200 to 1600 nm, and the Q-factor is more than 52,000 for one polarization state. For a chosen polarization, the resonator has an extinction ratio of nearly 15 dB, even though the diameter of the microfiber is more than 5 μm, which is unattainable for a normal MKR. By further optimizing and packaging, the device can be utilized as a weight sensor, with a sensitivity of 18.28 pm/g (51.2 pm/kPa) for the cavity resonant wavelength. Further, a vibration sensor on a HPMKR structure for detecting vibration from tens of hertz to several kilohertz is demonstrated.

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mentioning

confidence: 67%

Versatile hybrid plasmonic microfiber knot resonator

Chen

Yan

et al. 2017

Opt. Lett.

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“…For both experiments it is observed that the spectrum slightly changes under mechanical stress. This might stem from the birefringent effect of PDMS [44,45]. Since the sPCS is positioned between two crossed polarizers, an effect on the polarization state will be visible in transmission.…”

Section: Spcs Type Imentioning

confidence: 99%

Suppressing the Mechanochromism of Flexible Photonic Crystals

Kraft¹,

Harwardt²,

Schardt³

et al. 2023

Preprint

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Photonic crystal slabs (PCS) are a promising platform for optical biosensing. Yet, flexible applications based on PCS for biosensing have been limited, as the mechanical properties influence the optical ones. Here, we show the suppression of the mechanochromism effect for flexible PCS. We obtained flexible photonic crystal slabs by sputtering of a dielectric 100 nm Nb2O5 high refractive index layer onto a flexible nanostructured polydimethylsiloxane (PDMS) substrate with 370 nm grating period. The PCS exhibit a guided mode resonance at around 650 nm. We demonstrate that these flexible photonic crystal slabs show less than 0.5 nm resonance shift for 4% strain and call them stabilized PCS (sPCS). We compare this to a resonance shift of ~21 nm for ~4% strain of a flexible photonic crystal with a flexible nanoparticle high index layer (mechanochromatic PCS, mPCS). This high resonance shift is expected from the Bragg equations, where 4 % grating period change correspond to approximately 4 % change of the resonance wavelength (i.e., ~26 nm at a resonance wavelength of 650 nm), if changes in the mode effective refractive index are neglected. In a stretch series we obtain color-to-strain dependencies of 4.79 nm/% strain for mPCS and 0.11 nm/% strain for our stabilized sPCS. We analyze the suppression of the mechanochromism with detailed microscopy results. We observe that fissures and fractures form in the rigid waveguiding layer of the sPCS upon mechanical stress. An algorithm based on Holistically-Nested Edge Detection (HED) is used for automated counting of cracks. Rigid photonic crystal cells with sizes on the order of 10 µm to 100 µm are formed that explain the stable optical properties. Even more stable optical properties with less than 0.03 nm wavelength shift per 1% strain are demonstrated for sPCS with an additional dielectric 100 nm SiO2 low index layer beneath the Nb2O5 waveguide layer decoupling the waveguide further from the flexible PDMS substrate

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“…The schematic of the setup is shown in Figure 1a. We employ an orthogonally crossed polarizers approach [31,[41][42][43]. Embedding the PCS between two orthogonally crossed polarizers suppresses background light not coupling to the PCS [44,45].…”

Section: Intensity-based Camera Setup (Ibcs)mentioning

confidence: 99%

Intensity-Based Camera Setup for Refractometric and Biomolecular Sensing with a Photonic Crystal Microfluidic Chip

Kraft,

Lehmann,

Di Maria

et al. 2023

Biosensors

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Label-free sensing is a promising approach for point-of-care testing devices. Among optical transducers, photonic crystal slabs (PCSs) have positioned themselves as an inexpensive yet versatile platform for label-free biosensing. A spectral resonance shift is observed upon biomolecular binding to the functionalized surface. Commonly, a PCS is read out by a spectrometer. Alternatively, the spectral shift may be translated into an intensity change by tailoring the system response. Intensity-based camera setups (IBCS) are of interest as they mitigate the need for postprocessing, enable spatial sampling, and have moderate hardware requirements. However, they exhibit modest performance compared with spectrometric approaches. Here, we show an increase of the sensitivity and limit of detection (LOD) of an IBCS by employing a sharp-edged cut-off filter to optimize the system response. We report an increase of the LOD from (7.1 ± 1.3) × 10−4 RIU to (3.2 ± 0.7) × 10−5 RIU. We discuss the influence of the region of interest (ROI) size on the achievable LOD. We fabricated a biochip by combining a microfluidic and a PCS and demonstrated autonomous transport. We analyzed the performance via refractive index steps and the biosensing ability via diluted glutathione S-transferase (GST) antibodies (1:250). In addition, we illustrate the speed of detection and demonstrate the advantage of the additional spatial information by detecting streptavidin (2.9 µg/mL). Finally, we present the detection of immunoglobulin G (IgG) from whole blood as a possible basis for point-of-care devices.

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Effect of mechanical stress on optical properties of polydimethylsiloxane II – Birefringence

Cited by 19 publications

References 11 publications

Versatile hybrid plasmonic microfiber knot resonator

Versatile hybrid plasmonic microfiber knot resonator

Suppressing the Mechanochromism of Flexible Photonic Crystals

Intensity-Based Camera Setup for Refractometric and Biomolecular Sensing with a Photonic Crystal Microfluidic Chip

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