Subwavelength structures for broadband antireflection application

Ting, Chia Jen; Chen, Chi Feng; Chou, Chang‐Pin

doi:10.1016/j.optcom.2008.10.026

Cited by 36 publications

(19 citation statements)

References 10 publications

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“…With the advances in the technologies of microphotolithography, the feature size of a blazed grating can be manufactured in the subwavelength region, in which rigorous vector theories such as the Fourier modal method (FMM) [3][4][5], rigorous-coupled wave analysis (RCWA) [6], the true modal method (TMM), the coordinate transformation method (C-method), and the finite-difference time-domain (FDTD) method [7] must be used to calculate the diffraction efficiency of a grating. However, these rigorous vector diffraction methods are difficult to use because they are computationally intensive.…”

Section: Introductionmentioning

confidence: 99%

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

et al. 2014

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The accuracy of scalar diffraction theory (SDT) and effective medium theory (EMT) for analyzing a blazed grating is quantitatively demonstrated by making a comparison of diffraction efficiencies calculated by the two simplified methods to exact results from the Fourier modal method (FMM). It is found that when the normalized period is more than fivefold wavelength of incident light at normal incidence and is more than about tenfold wavelength at larger incident angle, SDT can be used to easily analyze effectively the transmittance characteristics of a blazed grating with divergence less than 1%. Particularly, for zeroth-order diffraction when the groove depth is less than threefold wavelength, the transmittance calculated by SDT with refractive index of 1.5 and normalized period of 5.0 agrees well with that of FMM at normal incidence. But, for ±1 orders, the validity of SDT is degraded from that for zeroth order. Generally, the deviation of transmittances between the SDT and the FMM increases as the incident angle and refractive index augment. Furthermore, when higher diffraction orders other than zeroth order are not propagating, the EMT is valid to evaluate the transmittance of a blazed grating at normal incidence. Similarly, the error of transmittances between the EMT and the FMM increases with the increase of incident angle and refractive index. The effectiveness of the SDT and the EMT for analyzing a blazed grating in the range of the normalized period far more than and less than the wavelength of incident light, respectively, is dependent on the parameters including incident angle, refractive index, normalized period, and normalized groove depth.

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Section: Introductionmentioning

confidence: 99%

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

et al. 2014

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“…For example, the optical properties of thin films are largely affected by transformations in surface structure. [1,2] Sub-micron surface patterns alter the wettability by the socalled Lotus effect. [3] And mechanical properties related to friction [4] and adhesion [5] are of interest in robotics and human/machine interfaces.…”

mentioning

confidence: 99%

Self‐assembled Dynamic 3D Fingerprints in Liquid‐Crystal Coatings Towards Controllable Friction and Adhesion

Liu

Broer

2014

Angewandte Chemie

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Chiral‐nematic polymer network coatings form a “fingerprint” texture through self‐assembly. For this purpose the molecular helix of the coating is oriented parallel to the substrate. The coating has a flat surface but when actuated by light in the presence of a copolymerized azobenzene compound, 3D fingerprint structures appear in the coating. The helix forms protrusions at the positions where the molecules are aligned parallel to the surface and withdraws at the positions where the orientation is perpendicular. This process proceeds rapidly and is reversible, that is, the fingerprint‐shaped protrusions disappear when the light is switched off. The texture in the on‐state resembles that of a human fingerprint and is used to manipulate the gripping friction of a robotic finger. The friction coefficient drops by a factor of four to five when the fingerprint switched on because of reduced surface contacts.

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“…The micro-replication process combines with the original structure template fabrication realized by interference lithography, Ni mold electroplation and replication using UV imprinting into plastic on a polyethylene terphthalate (PET) substrate [12]. Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Subwavelength-structured technology can be realized that placed a plurality of subwavelength nanostructure onto the element surface, called the antireflection subwavelength-structured surface (ASS). Recently, ASS has been proposed as an applicable alternative based on both the theoretical and experimental studies [7][8][9][10][11][12][13][14]. An ASS in silicon was designed by rigorous coupled-wave analysis and fabrication using binary optics technology [9].…”

Section: Introductionmentioning

confidence: 99%

Heat-insulation film with gold layer deposited on antireflection subwavelength-structured surface

Ting

Chen

Hsu

2010

Optik

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Subwavelength structures for broadband antireflection application

Cited by 36 publications

References 10 publications

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

Validity of scalar diffraction theory and effective medium theory for analysis of a blazed grating microstructure at oblique incidence

Self‐assembled Dynamic 3D Fingerprints in Liquid‐Crystal Coatings Towards Controllable Friction and Adhesion

Heat-insulation film with gold layer deposited on antireflection subwavelength-structured surface

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