High sensitivity waveguide grating sensor based on radiative losses

Kochergin, Vladimir; Avrutsky, Ivan; Zhao, Yang

doi:10.1016/s0956-5663(00)00072-5

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…Subwavelength gratings known as an antireflective structure [35] have been incorporated into organic solar cells [36]. Gratings are used as optical couplers for optical thin film sensors [37][38][39]. The optical resonator of polymeric distributed feedback lasers is presented by a periodically corrugated surface [40][41][42][43].…”

Section: Diffraction Gratingsmentioning

confidence: 99%

Light trapping in organic solar cells

Niggemann

Riede

Gombert

et al. 2008

Physica Status Solidi (a)

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One key problem in optimizing organic solar cells is to maximize the absorption of incident light and to keep the charge carrier transport paths as short as possible in order to minimize recombination losses during the charge carrier extraction. The large versatility of organic semiconductors and compositions requires specific optimization of each system. Due to the small thickness of the functional layers in the order of several ten nanometres, coherent optics has to be considered and therefore interference effects play a dominant role. Here we present and discuss concepts for light trapping in organic solar cells. These are wide gap layers in planar solar cells, folded solar cell architectures benefiting from the illumination under inclined incident angles and multiple reflections and absorptions as well as diffraction gratings embossed into the photoactive layer

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Section: Diffraction Gratingsmentioning

confidence: 99%

Light trapping in organic solar cells

Niggemann

Riede

Gombert

et al. 2008

Physica Status Solidi (a)

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“…This method, the so-called Rayleigh-Fourier [18,21] or Rayleigh-Fourier-Kiselev [22,23] approach, is based on resolving the electromagnetic field into harmonics and is commonly used to calculate the radiation loss coefficients of shallow grating coupled waveguide sensors [1,24,25].…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical study on grating depth effects in grating coupled waveguide sensors

et al. 2005

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The in-coupling process for grating-coupled planar optical waveguide sensors is investigated in the case of TE waves. A simple analytical model based on the Rayleigh-Fourier-Kiselev method is applied to take into account the depth of the grating coupler, which is usually neglected in the modeling. Analytical expressions are derived both for the position and width of the in-coupling peaks to illustrate the effects of grating depth on the guided mode resonances in grating coupled waveguide sensors. Numerical computations verify the model for shallow gratings both in terms of peak shape and position and provide the limitations for the analytical formulas.3

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“…The development of optical sensors for the detection of bioaffinity reactions has been of strong interest in the past decades. Besides cost reduction, many of these efforts were made to reduce the preparation steps involved, for example, by using label-free detection of analytes, − or to lower the detection limits by using chemical amplification schemes. − In addition, various physical principles have been further developed such as total internal reflection, surface plasmon resonance, or resonance light scattering − in order to increase the sensitivity and to lower the detection limits. However, although many of these new optical sensors have shown excellent performance for specific applications, the technical requirements/costs are high and the throughput is limited.…”

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confidence: 99%