Double-Sided Anti-Reflection Nanostructures on Optical Convex Lenses for Imaging Applications

Jang, Hyuk Jae; Kim, Yeong Jae; Yoo, Young Jin; Lee, Gil Ju; Kim, Min Seok; Chang, Ki Soo; Song, Young Min

doi:10.3390/coatings9060404

Cited by 17 publications

(8 citation statements)

References 28 publications

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“…Larger-scale ( λ  ) structured layers are widely used for increasing light transmission in solar cells [12]- [20], fabrication of lenses and imaging [21], extreme temperature applications [22], super-hydrophobic antireflection applications [23] [24] like anti-fogging [25], light extraction from LEDs [11] [26]- [30], lasers [3] [31] [32], and enhancing sensitivity of sensors [33]- [38]. Sub-wavelength structures can provide smooth change of index from one medium to another.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Anti-Reflection Coatings for Enhancing Transmission of Light

Mousavi¹,

Mousavu²,

Busani³

et al. 2019

JAMP

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Nanostructured, sub-wavelength anti-reflection layers (NALs) have attracted much attention as a new generation of anti-reflection surfaces. Among different designs, sub-wavelength periodic nanostructures are capable of enhancing transmission of coherent light through an interface without inducing scattering. In this work, we have explored a new profile for periodic NALs capable of transmitting IR light with higher efficiency compared to NALs based on a parabolic profile. To achieve high transmission and low diffraction, the profile and pitch of the nanostructured NALs are calculated using a combination of a multi-layer modeling and Rigorous Coupled Wave (RCWA) analysis.available materials with desired refractive indexes. Also, the mismatch between the thermal expansion coefficients of different layers, introduces residual stresses under high power illumination (this is a serious limitation for mechanical stability [6], and for applications like high power laser transmission particularly in the infrared where thicker layers are required) [7] [8].Nanostructured ARC layers (NALs [9]) on the other hand, work by a gradual, adiabatic change of effective refractive index from that of the incidence medium (air) to that of the bulk material (silicon in our case). These structures are also referred as moth-eye structures [10] due to their resemblance to the surface of a moth's eye [11]. In this paper, we will refer to nanostructures designed for re-

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Section: Introductionmentioning

confidence: 99%

Nanostructured Anti-Reflection Coatings for Enhancing Transmission of Light

Mousavi¹,

Mousavu²,

Busani³

et al. 2019

JAMP

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“…Nowadays, reversible antireflection functionality has attracted great attention due to various prospective applications in display screens, optical lenses, sensors, internal partitions, and numerous architectural or vehicle windows. 33 Shape memory polymers are promising candidates for achieving the optical modulation of antireflection in view of the fact that the polymer configurations change in response to external stimuli under different environments. 34 Consequently, the shape memory polymers with structure arrays prospectively promote the development of reversibly erasable antireflection coatings.…”

Section: ■ Introductionmentioning

confidence: 99%

Reversibly Erasable Broadband Omnidirectional Antireflection Coatings Inspired by Inclined Conical Structures on Blue-Tailed Forest Hawk Dragonfly Wings

Tseng

Chen

et al. 2020

ACS Appl. Mater. Interfaces

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Blue-tailed forest hawk dragonfly (Orthetrum triangulare) wings, covered with inclined conical structures, are studied for their high transparency and low reflectance for large viewing angles. However, limited by existing technologies, the exquisite inclined structures are not replicated easily or applied adequately. Here, we combine a shear-induced self-assembly approach and a colloidal lithography technology to create omnidirectional antireflection structures that are inspired by dragonfly wings. Nonclose-packed colloid crystals are spin-coated and serve as structural templates in a plasma etching procedure to pattern subwavelength inclined conical structures directly on shape memory polymer-coated substrates. The dependence of the antireflection functionality on the shape and inclination of conical structures is systematically investigated in this research. Compared with a featureless substrate, the structure-covered substrate can display an approximately 8% higher average transmittance in the visible wavelength range at normal incidence and even approximately 23% higher average transmittance as the incident angle increases to 75°. Moreover, the reconfigurable structures composed of shape memory polymers can be repeatedly deformed and recovered as a result of external stimuli at ambient conditions, and the corresponding broadband omnidirectional antireflection functionality is therefore reversibly erased and restored.

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“…Surfaces with low reflections and enhanced absorption over an ultra-wideband region have potential applications in the field of space research, biomedical engineering, − photovoltaics, − optics, ,− optoelectronics, and so forth. Moreover, the abundance of silicon (Si) material, its complementary metal–oxide–semiconductor (CMOS) biocompatibility, and low-cost, have allowed Si-based devices to dominate the semiconductor industry.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Grids of Optimized Ti-Compounds on Si for Ultra-Wideband Optical Absorption

Bangera

Appaiah

2020

ACS Appl. Mater. Interfaces

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Typically, the optical applications of silicon (Si) are limited to wavelengths below ∼1100 nm. However, there is significant research on Si surface modification, which tries to extend the optical properties of Si further into the infrared (IR) region. In this work, we present an ultra-wideband complementary metal–oxide–semiconductor (CMOS)-biocompatible Si-based optical absorber with a hydrophobic surface. It consists of patterned three-dimensional grid-like structures of optimized compounds of titanium (Ti) on n-type Si (n-Si). Here, the Ti-compounds on Si were formed by subsequent deposition of patterned Ti and annealing. Moreover, we have shown that there are two possible Ti-compounds formed on Si, depending on the thickness of Ti deposited and the annealing time. The composition and the corresponding absorbance spectra for the two possibilities of Ti-compounds on n-Si, that is, Ti–O/Ti–O–Si/Ti–Si/n-Si (type 1) and Ti–O/Ti–O–Si/n-Si (type 2), were confirmed using an X-ray photoelectron spectroscopy depth profiler and ultraviolet–visible–near-infrared spectrometer. We also illustrate how type 1 improves the absorption of radiation in the IR region. Further, we experimentally demonstrate that our fabricated absorber has an average reflectance (R) of <25% and an average absorbance of approximately 60% for wavelengths ranging from 200 to 3300 nm. The average % R for wavelengths from 400 to 1500 nm is <10%. The surface hydrophobicity for the fabricated absorbers was confirmed using a water contact angle (WCA) measurement system with WCAs >100°, which makes the surface hydrophobic.

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Double-Sided Anti-Reflection Nanostructures on Optical Convex Lenses for Imaging Applications

Cited by 17 publications

References 28 publications

Nanostructured Anti-Reflection Coatings for Enhancing Transmission of Light

Nanostructured Anti-Reflection Coatings for Enhancing Transmission of Light

Reversibly Erasable Broadband Omnidirectional Antireflection Coatings Inspired by Inclined Conical Structures on Blue-Tailed Forest Hawk Dragonfly Wings

Three-Dimensional Grids of Optimized Ti-Compounds on Si for Ultra-Wideband Optical Absorption

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