Graphene oxide-based waveguide polariser: From thin film to quasi-bulk

Lim, W.H.; Yap, Y. K.; Chong, Wu; Pua, Chang Hong; Huang, N. M.; Rue, R.M. De La; Ahmad, Harith

doi:10.1364/oe.22.011090

Cited by 64 publications

(60 citation statements)

References 20 publications

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“…It was found that the TE-polarized light is suppressed by the GO-coated waveguide to more than −20 dB with reference to TM-polarized light. Suppression of the TE-mode is due to absorption of electric field by the GO layers, which was reported in [ 25 ].…”

Section: Device Fabrication and Experimentsmentioning

confidence: 76%

All-Optical Graphene Oxide Humidity Sensors

Lim

Yap

Wang

et al. 2014

Sensors

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The optical characteristics of graphene oxide (GO) were explored to design and fabricate a GO-based optical humidity sensor. GO film was coated onto a SU8 polymer channel waveguide using the drop-casting technique. The proposed sensor shows a high TE-mode absorption at 1550 nm. Due to the dependence of the dielectric properties of the GO film on water content, this high TE-mode absorption decreases when the ambient relative humidity increases. The proposed sensor shows a rapid response (<1 s) to periodically interrupted humid air flow. The transmission of the proposed sensor shows a linear response of 0.553 dB/% RH in the range of 60% to 100% RH.

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Section: Device Fabrication and Experimentsmentioning

confidence: 76%

All-Optical Graphene Oxide Humidity Sensors

Lim

Yap

Wang

et al. 2014

Sensors

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“…[87][88][89] Although label-free optical biosensing platforms have been reported to be enhanced by using structural properties of GO, as far as we are concerned, the elucidation of the optical/photonic properties or phenomena underlying such improvements have been scarcely elaborated until now, which can be subject of in-depth investigation. [94][95][96] Recently, Chung et al, reported the SPR enhancement at pristine graphene/metal (Au) interface. [90] Optical fibers are a particular example of optical waveguides.…”

Section: Go In Label-free Optical Biosensingmentioning

confidence: 99%

Graphene Oxide as an Optical Biosensing Platform: A Progress Report

2018

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IntroductionAs a 2D material, graphene oxide (GO) is a lattice-like nanostructure of hexagonal carbon rings disrupted by oxygen-containing moieties. In 2012, we discussed the outstanding physicochemical properties offered by GO and how these features can be exploited in unprecedented optical biosensing systems. [1] In fact, GO can be processed in suspension, easily complexed with biomolecules, and offers a universal highly efficient long-range photoluminescence quenching agent-among other functional properties. Furthermore, we highlighted that GO photoluminescences with energy transfer donor/acceptor molecules exposed A few years ago, crucial graphene oxide (GO) features such as the carbon/oxygen ratio, number of layers, and lateral size were scarcely investigated and, thus, their impact on the overall optical biosensing performance was almost unknown. Nowadays valuable insights about these features are well documented in the literature, whereas others remain controversial. Moreover, most of the biosensing systems based on GO were amenable to operating as colloidal suspensions. Currently, the literature reports conceptually new approaches obviating the need of GO colloidal suspensions, enabling the integration of GO onto a solid phase and leading to their application in new biosensing devices. Furthermore, most GO-based biosensing devices exploit photoluminescent signals. However, further progress is also achieved in powerful label-free optical techniques exploiting GO in biosensing, particularly using optical fibers, surface plasmon resonance, and surface enhanced Raman scattering. Herein, a critical overview on these topics is offered, highlighting the key role of the physicochemical properties of GO. New challenges and opportunities in this exciting field are also highlighted.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201805043.in a planar surface. [1] However, GO properties can be tailored according to its oxidation degree, lateral size, and number of layers, which was something little explored 6 years ago, and thus their impact on the overall biosensing performance was almost unknown. In addition, most of the biosensing systems based on GO were amenable to working as colloidal suspensions. Though, recent literature reports conceptually new approaches obviating the need of colloidal suspensions, which facilitates integration of GO-based biosensors into the solid phase and allows for their applications in new devices. Furthermore, the majority of the GO-based optical biosensing techniques rely on photoluminescent signals. However, further progress has also been achieved in powerful label-free optical techniques exploiting GO in biosensing. Here, we introduce a progress report on this exciting topic, underscoring challenges and opportunities in (bio)sensing accordingly. Number of LayersGO aqueous suspensions are highly stable in the form of mono layers. However, GO multilayer films can be built via

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“…In Ref. [15], a broadband GO-polymer waveguide polarizer with a high PDL of ~ 40 dB was demonstrated, where the GO films were introduced onto an SU8 polymer waveguide using drop-casting methods. The GO film thickness for each drop-casting step was ~ 0.5 µm and the drop coating diameter was ~1.3 mm, neither being ideal for achieving precise control of the placement, thickness, and length of the GO films.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide (GO) 2D layered films for high efficiency integrated polarizers in ring resonators and waveguides

Moss¹,

Wu²,

Jiao³

et al. 2020

Preprint

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<p>Polarization selective devices, such as polarizers and polarization selective resonant cavities (e.g., gratings and ring resonators), are core components for polarization control in optical systems and find wide applications in polarization-division-multiplexing, coherent optical detection, photography, liquid crystal display, and optical sensing. In this paper, we demonstrate integrated waveguide polarizers and polarization-selective micro-ring resonators (MRRs) incorporated with graphene oxide (GO). We achieve highly precise control of the placement, thickness, and length of the GO films coated on integrated photonic devices by using a solution-based, transfer-free, and layer-by-layer GO coating method followed by photolithography and lift-off processes. The latter overcomes the layer transfer fabrication limitations of 2D materials and represent a significant advance towards manufacturing integrated photonic devices incorporated with 2D materials. We measure the performance of the waveguide polarizer for different GO film thicknesses and lengths versus polarization, wavelength, and power, achieving a very high polarization dependent loss (PDL) of ~ 53.8 dB. For GO-coated integrated MRRs, we achieve an 8.3-dB polarization extinction ratio between the TE and TM resonances, with the extracted propagation loss showing good agreement with the waveguide results. Furthermore, we present layer-by-layer characterization of the linear optical properties of 2D layered GO films, including detailed measurements that conclusively determine the material loss anisotropy of the GO films as well as the relative contribution of film loss anisotropy versus polarization-dependent mode overlap, to the device performance. These results offer interesting physical insights and trends of the layered GO films from monolayer to quasi bulk like behavior and confirm the high-performance of integrated polarization selective devices incorporated with GO films.</p>

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Graphene oxide-based waveguide polariser: From thin film to quasi-bulk

Cited by 64 publications

References 20 publications

All-Optical Graphene Oxide Humidity Sensors

All-Optical Graphene Oxide Humidity Sensors

Graphene Oxide as an Optical Biosensing Platform: A Progress Report

Graphene oxide (GO) 2D layered films for high efficiency integrated polarizers in ring resonators and waveguides

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