Strong transmittance above the light line in mid-infrared two-dimensional photonic crystals

Kraeh, Christian; Martínez-Hurtado, Juan Leonardo; Zeitlmair, Martin; Popescu, Anca; Hedler, H.; Finley, Jonathan J.

doi:10.1063/1.4921975

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…In terms of feasibility of the experimental realization, the required photonic band-gap waveguides have been achieved experimentally in various types of PCs 49 – 59 , including two-dimensional PCs with a high aspect ratio of the cylinders 49 – 51 . They are well described by the two-dimensional PC model with an infinite cylinder length in the z -direction considered in our model and can be used to observe the OPF.…”

Section: Discussionmentioning

confidence: 99%

Gradient-induced long-range optical pulling force based on photonic band gap

Lu,

Krasavin,

Lan

et al. 2024

Light Sci Appl

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Optical pulling provides a new degree of freedom in optical manipulation. It is generally believed that long-range optical pulling forces cannot be generated by the gradient of the incident field. Here, we theoretically propose and numerically demonstrate the realization of a long-range optical pulling force stemming from a self-induced gradient field in the manipulated object. In analogy to potential barriers in quantum tunnelling, we use a photonic band gap design in order to obtain the intensity gradients inside a manipulated object placed in a photonic crystal waveguide, thereby achieving a pulling force. Unlike the usual scattering-type optical pulling forces, the proposed gradient-field approach does not require precise elimination of the reflection from the manipulated objects. In particular, the Einstein-Laub formalism is applied to design this unconventional gradient force. The magnitude of the force can be enhanced by a factor of up to 50 at the optical resonance of the manipulated object in the waveguide, making it insensitive to absorption. The developed approach helps to break the limitation of scattering forces to obtain long-range optical pulling for manipulation and sorting of nanoparticles and other nano-objects. The developed principle of using the band gap to obtain a pulling force may also be applied to other types of waves, such as acoustic or water waves, which are important for numerous applications.

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Section: Discussionmentioning

confidence: 99%

Gradient-induced long-range optical pulling force based on photonic band gap

Lu,

Krasavin,

Lan

et al. 2024

Light Sci Appl

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“…Generally, two types of such crystals can be distinguished [34,35]: photonic crystals of the "hole" type (Figure 3a), consisting of cylinders with a low refractive index embedded in a medium with a high refractive index [36][37][38][39], and the "rod" type (Figure 3b), consisting of rods with a high refractive index surrounded by a medium with a low refractive index [35,[40][41][42][43][44][45]. Both holes and rods can be arranged differently to create different 2D crystal lattices.…”

Section: D Photonic Crystalsmentioning

confidence: 99%

Photonic Crystal Structures for Photovoltaic Applications

Starczewska,

Kępińska

2024

Materials

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Photonic crystals are artificial structures with a spatial periodicity of dielectric permittivity on the wavelength scale. This feature results in a spectral region over which no light can propagate within such a material, known as the photonic band gap (PBG). It leads to a unique interaction between light and matter. A photonic crystal can redirect, concentrate, or even trap incident light. Different materials (dielectrics, semiconductors, metals, polymers, etc.) and 1D, 2D, and 3D architectures (layers, inverse opal, woodpile, etc.) of photonic crystals enable great flexibility in designing the optical response of the material. This opens an extensive range of applications, including photovoltaics. Photonic crystals can be used as anti-reflective and light-trapping surfaces, back reflectors, spectrum splitters, absorption enhancers, radiation coolers, or electron transport layers. This paper presents an overview of the developments and trends in designing photonic structures for different photovoltaic applications.

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“…Finite 2D periodicity can be accomplished either by creating holes inside a slab or by forming pillars of a dense material ( Figure 1a). While in the former case the vertical confinement along the z-axis is accomplished by total internal reflection of light, in the latter case, the pillars should be high enough to increase the overall effective refractive index of the guiding mode and therefore being able to confine the wave along the z-axis [6]. For sensing applications, the guiding wave should be in maximum contact with the analyte in order to have a sensitive system [7].…”

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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Strong transmittance above the light line in mid-infrared two-dimensional photonic crystals

Cited by 5 publications

References 30 publications

Gradient-induced long-range optical pulling force based on photonic band gap

Gradient-induced long-range optical pulling force based on photonic band gap

Photonic Crystal Structures for Photovoltaic Applications

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

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