Slow-light enhanced absorption for bio-chemical sensing applications: potential of low-contrast lossy materials

Pedersen, Jesper Goor; Xiao, Sanshui; Mortensen, N. Asger

doi:10.2971/jeos.2008.08007

Cited by 11 publications

(14 citation statements)

References 14 publications

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“…The mechanism by which light-matter interaction leads to enhanced absorptance when the spacing period is close to the wavelength of light in the structure is known as "slow light". This phenomenon arises from the reduction of the group velocity of the light propagating through the photonic crystal for those wavelengths within the photonic band edge 19 , in our case λ ≈ 440 nm and λ ≈ 520 nm (Fig. 2).…”

mentioning

confidence: 82%

“…The absorptance will then be enhanced for those wavelengths for which the slow light phenomena occurs simultaneously with the appropriate positioning of the photosynthetic membranes within the iridoplast. In general terms it is established that while absorption is reduced for those wavelengths within the photonic band gap (usually shown as strong reflectance in natural photonics) it can be strongly enhanced at the band gap edges 19 . We calculated the absorptance of the organelles as A Ir (λ)=1-R(λ)-T(λ) 2 , where R and T are the reflectance and transmittance of the multilayer at wavelength λ respectively.…”

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confidence: 99%

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Photonic multilayer structure of Begonia chloroplasts enhances photosynthetic efficiency

et al. 2016

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Enhanced light-harvesting is an area of interest for optimising both natural photosynthesis and artificial solar energy capture 1,2. While iridescence has been shown to exist widely and in diverse forms in plants and other photosynthetic organisms and symbioses 3,4 , there has yet to be any direct link demonstrated between iridescence and photosynthesis. Here we show that epidermal chloroplasts, also known as iridoplasts, in shade-dwelling species of Begonia 5 , notable for their brilliant blue iridescence, have a photonic crystal structure formed from a periodic arrangement of the light-absorbing thylakoid tissue itself. This structure enhances photosynthesis in two ways: by increasing light capture at the predominantly green wavelengths available in shade conditions, and by directly enhancing quantum yield by 10-15% under low light conditions. These findings together imply that the iridoplast is a highly modified chloroplast structure adapted to make best use of the extremely low light conditions in the tropical forest understory in which it is found 5,6. A phylogenetically diverse range of shade-dwelling plant species have been found to produce similarly structured chloroplasts 7-9 , suggesting that the ability to produce chloroplasts whose

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confidence: 82%

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confidence: 99%

Photonic multilayer structure of Begonia chloroplasts enhances photosynthetic efficiency

et al. 2016

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“…Obviously, the apparent absorption-induced saturation of the group index n g will have consequences for the group-index enhanced absorption [22]. In the following we numerically study this interplay for the hollow-core fiber proposed in Ref.…”

Section: Slow-light Modes In a Hollow-core Photonic Band Gap Fibermentioning

confidence: 95%

Slow-light enhanced absorption in a hollow-core fiber

et al. 2010

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Light traversing a hollow-core photonic band-gap fiber may experience multiple reflections and thereby a slow-down and enhanced optical path length. This offers a technologically interesting way of increasing the optical absorption of an otherwise weakly absorbing material which can infiltrate the fibre. However, in contrast to structures with a refractive index that varies along the propagation direction, like Bragg stacks, the translationally invariant structures studied here feature an intrinsic trade-off between light slow-down and filling fraction that limits the net absorption enhancement. We quantify the degree of absorption enhancement that can be achieved and its dependence on key material parameters. By treating the absorption and index on equal footing, we demonstrate the existence of an absorption-induced saturation of the group index that itself limits the maximum absorption enhancement that can be achieved.

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“…In a PhC waveguide, when the frequency of the wave is close to the band edge of the dispersion diagram, the group velocity of the guided mode, defined as the derivative of the wavenumber with respect to the frequency, approaches zero, which means that the velocity of the guided energy becomes very small. The group velocity for propagating waves crucially affects the efficiency of the light-matter interaction: the lower the group velocity, the higher the intensity of photon-matter interaction [4]. For sensing applications, especially when the concentration of the analyte and its variation is low, efficient interaction between the analyte and light plays an important role; since it not only determines the dimension of the device, but also the sensitivity of the sensor [5].…”

Section: Sensor Based On Photonic Crystal Waveguidementioning

confidence: 99%

Hybrid Photonic Crystal-Surface Plasmon Polariton Waveguiding System for On-Chip Sensing Applications

et al. 2018

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In this paper, a hybrid optical guiding system based on low group velocity offered by photonic crystal (PhC) waveguides and vertical confinement as well as high field enhancement of. Surface lasmon polaritons (SPP) is proposed. We show that for efficient sensing, conventional two-dimensional PhC waveguides with finite height require a high aspect ratio in the order of 30 in order to efficiently confine the guiding mode. The fabrication of devices with such a high aspect ratio is considered too challenging and inefficient for mass production. By combining a PhC waveguide and SPPs, the proposed system efficiently confines the optical mode vertically while benefiting from the lateral confinement enabled by PhC structures. As a result, the required aspect ratio drops to about 4 making the fabrication in large scale feasible. This design provides strong light-matter interaction within small dimensions, which is beneficial for miniaturizing on-chip photonic sensors.

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Slow-light enhanced absorption for bio-chemical sensing applications: potential of low-contrast lossy materials

Cited by 11 publications

References 14 publications

Photonic multilayer structure of Begonia chloroplasts enhances photosynthetic efficiency

Photonic multilayer structure of Begonia chloroplasts enhances photosynthetic efficiency

Slow-light enhanced absorption in a hollow-core fiber

Hybrid Photonic Crystal-Surface Plasmon Polariton Waveguiding System for On-Chip Sensing Applications

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