Analysis of antireflection-structured surfaces with continuous one-dimensional surface profiles

Raguin, Daniel H.; Morris, G. Michael

doi:10.1364/ao.32.002582

Cited by 156 publications

(98 citation statements)

References 23 publications

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“…For background, the reflectivity and transmission angular distribution of periodic structures are given by the well-known grating equation, 4 which qualitatively describes the studied two-dimensional (2-D) system:…”

Section: Theorymentioning

confidence: 99%

Angle-independent structural colors of silicon

Højlund-Nielsen

Weirich²,

Nørregaard

et al. 2014

J. Nanophoton

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Abstract. Structural colors are optical phenomena of physical origin, where microscale and nanoscale structures determine the reflected spectrum of light. Artificial structural colors have been realized within recent years. However, multilayer structures require substantial fabrication. Instead we considered one-layer surface textures of silicon. We explored four patterns of square structures in a square lattice with periods of 500, 400, 300, and 200 nm. The reflectivity and daylight-colors were measured and compared with simulations based on rigorously coupledwave analysis with excellent agreement. Based on the 200-nm periodic pattern, it was found that angle-independent specular colors up to 60 deg of incidence may be provided. The underlying mechanisms include (1) the suppression of diffraction and (2) a strong coupling of light to localized surface states. The strong coupling yields absorption anomalies in the visual spectrum, causing robust colors to be defined for a large angular interval. The result is a manifestation of a uniformly defined color, similar to pigment-based colors. These mechanisms hold potential for color engineering and can be used to explain and predict the structural-color appearance of silicon-based textures for a wide range of structural parameters.

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Section: Theorymentioning

confidence: 99%

Angle-independent structural colors of silicon

Højlund-Nielsen

Weirich²,

Nørregaard

et al. 2014

J. Nanophoton

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“…14a. The effectiveness of these structures concerning the optical effects which are similar to a GRIN antireflective surface depend on the aspect ratio and structure details molded (Lalanne and Hutley 2003;Raguin and Morris 1993). The random surface structures cannot simply be investigated by comparing profile-sections or using surface parameters mentioned in the previous chapter.…”

Section: Random Micro-structuresmentioning

confidence: 99%

Study on the replication quality of micro-structures in the injection molding process with dynamical tool tempering systems

et al. 2010

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The injection molding of micro-structures is a promising mass-production method for a broad range of materials. However, the replication quality of these structures depends significantly on the heat flow during the filling stage. In this paper, the filling and heat transfer of v-groove and random structures below 5 lm is investigated with the help of an AFM (atomic force microscope) and thermo couples. A numerical model is developed to predict the filling of surface structures during the filling and packing stage. The model implies the use of simple fully developed flow models taking the power-law material model into account. This permits investigation into which ways several processing parameters affect the polymer flow in the surface structures. The mold wall temperature, which has significant effects on the polymer flow, is varied by using a variothermal mold temperature control system to validate the model proposed.

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“…EMT may be used to model periodic structures, such as gratings, as homogeneous layers with anisotropic properties. In the zeroth-order EMT approximations [12] the effective refractive indices for TE and TM polarizations at any depth are…”

Section: A Theoreticalmentioning

confidence: 99%

“…Artificial dielectrics are best known for their antireflection (AR) properties, both in the visible [12]- [14] and at millimeter and submillimeter wavelengths [15], [16]. The variable artificial dielectric retarder (VADR) device was recently proposed for use at terahertz frequencies [17] and initial experiments have demonstrated the device's principle of operation at 100 GHz [18], with a measured retardance of up to 74 .…”

mentioning

confidence: 99%

Artificial dielectric devices for variable polarization compensation at millimeter and submillimeter wavelengths

Drysdale

Blaikie

Chong

et al. 2003

IEEE Trans. Antennas Propagat.

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Abstract-Variable polarization compensation has been demonstrated at 100 GHz. The device consists of two interlocking V-groove artificial dielectric gratings that produce a birefringence that varies with the separation distance. A maximum retardance of 74 has been obtained experimentally in a silicon device, in good agreement with rigorous coupled-wave computer simulations. Further simulations predict that adding quarter wave dielectric antireflection (AR) coatings to the outer surfaces of the device can reduce the insertion loss to below 4 dB. The use of rectangular grooved gratings provides increased retardance and reduced loss. It is predicted that a coupled device with a rectangular grooved gratings will be capable of maximum retardance in excess of 180 , with low insertion loss ( 0.6 dB). The sensitivity of the wave retardation as a function of mechanical separation has a peak value of 485 /mm. The design and micromachining fabrication techniques scale for operation at submillimeter wavelengths.

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Analysis of antireflection-structured surfaces with continuous one-dimensional surface profiles

Cited by 156 publications

References 23 publications

Angle-independent structural colors of silicon

Angle-independent structural colors of silicon

Study on the replication quality of micro-structures in the injection molding process with dynamical tool tempering systems

Artificial dielectric devices for variable polarization compensation at millimeter and submillimeter wavelengths

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