Structrual Coloration of Surfaces With Microstructures Replicated by Non-Isothermal Precision Glass Molding

2020 ◽  
Author(s):  
Yong Zhong ◽  
Ruxu Du ◽  
Lin Zhang ◽  
Allen Y. Yi
Keyword(s):  
Periodic Structures ◽  
Low Cost ◽  
Incident Light ◽  
Molding Process ◽  
Glass Molding ◽  
Precision Glass Molding ◽  
Structural Colors ◽  
Periodic Grating ◽  
Light Beams ◽  
Micro Structures

Abstract Micro/nano periodic structures are generally adopted in diffraction gratings. As an important optical component, the diffraction grating has the capability to split and diffract incident white light beams into iridescent beams travelling in different directions. The emerging coloration is a form of structural coloration. In this paper, the non-isothermal precision glass molding is introduced for fast replication of periodic grating structures, which are employed to render iridescent colors on surfaces. Firstly, the effect of colorization and periodic grating profiles is theoretically analyzed. Secondly, different periodic micro gratings on silicon wafer, which are generally generated by photolithography, are employed in non-isothermal precision glass molding process as mold inserts. The molding result indicates that the periodic grating space and depth of grating structures can be precisely replicated from the mold inserts to polymer substrates. Subsequently, the split and iridescent color effects are demonstrated with monochromatic & white incident light beam and compared between samples with different periodic grating spaces. The optical effects of the replicated micro-structures confirm the feasibility of this method. The proposed non-isothermal precision glass molding process provides an alternative manufacturing option for realizing structural colors with large-volume and low-cost.

Coloration of Surfaces with Periodic Microstructures Replicated by Non-isothermal Precision Molding

2020 ◽  
Author(s):  
Yong Zhong ◽  
Ruxu Du ◽  
Lin Zhang ◽  
Allen Y. Yi
Keyword(s):  
Periodic Structures ◽  
Low Cost ◽  
Incident Light ◽  
Optical Diffraction ◽  
Molding Process ◽  
Structural Colors ◽  
Periodic Grating ◽  
Periodic Microstructures ◽  
Light Beams ◽  
Micro Structures

Abstract Micro/nano periodic structures are generally adopted in diffraction gratings. As an important optical component, the diffraction grating has the capability to split and diffract incident white light beams into iridescent beams dispersing to different directions. The appearance of coloration is a form of structural coloration by optical diffraction. In this paper, the non-isothermal precision molding is introduced for rapid & precise replication of periodic micro/nano grating structures, which are employed to render iridescent colors onto surfaces. Firstly, the effect of colorization and periodic grating profiles are theoretically analyzed. Secondly, different periodic micro gratings on silicon wafer, which are generally generated by photolithography, are employed in non-isothermal precision molding process as mold inserts. The molding result indicates that the periodic grating space and depth of grating structures can be precisely replicated from the mold inserts to polymer substrates. Subsequently, the split and iridescent color effects are demonstrated with monochromatic & white incident light beam and compared between samples with different periodic grating spaces. The optical effects of the replicated micro-structures confirm the feasibility of this method. The proposed non-isothermal precision molding process provides an alternative manufacturing option for realizing structural colors with large volume and low cost.

Measuring Optical Properties of Advanced Nano/Micro-Periodic Structures Fabricated by Multi-Exposure Interference Lithography

2020 ◽  
Author(s):  
Shuzo Masui ◽  
Masaki Michihata ◽  
Kiyoshi Takamasu ◽  
Satoru Takahashi
Keyword(s):  
Periodic Structures ◽  
Low Cost ◽  
Industrial Applications ◽  
Interference Lithography ◽  
High Dispersion ◽  
Optical Elements ◽  
Precise Control ◽  
Periodic Grating ◽  
Interference Fringes ◽  
Multiple Interference

Abstract Functional optical elements based on nano/micro-periodic structures have attracted much attention. Since the fabrication of these dual-periodic structures requires precise control of periodicity, the semiconductor process such as an electron beam lithography has been mainly employed. However, these techniques have problems with expensive and low throughput for industrial applications. Therefore, there remains a need for low cost and high throughput fabrication methods of dual-periodic structures. Then we developed a multi-exposure interference lithography (MEIL) system using rotational Lloyd’s mirror interferometer to overcome these problems. The advantages of interference lithography are a large processing area and low cost. Our developed rotational Lloyd’s mirror setup enables us to a highly precise superposition of multiple interference fringes by multi-exposure. Furthermore, we developed a measurement setup for reflective diffractive elements using a two axial rotating stage and measured the diffraction properties of the fabricated dual-periodic diffraction gratings. In this paper, as a demonstration, we succeeded in the fabrication of high-dispersion diffraction grating with an enhanced diffraction efficiency of the −3rd order light. The fabricated shapes have a periodicity of 1997 nm and 665 nm. Furthermore, it was confirmed that the intensity of the −3rd order light was enhanced by about 10 times compared to the single periodic grating.

Wafer Level Glass Molding

2012 ◽  
Vol 523-524 ◽  
pp. 1001-1005 ◽  
Author(s):  
Martin Hünten ◽  
Daniel Hollstegge ◽  
Fritz Klocke
Keyword(s):  
Wafer Level ◽  
Molding Process ◽  
Optical Components ◽  
New Approach ◽  
Glass Molding ◽  
Wafer Scale ◽  
Precision Glass Molding

Manufacturing of micro optical components is approached with many different technologies. In this paper it is presented how the precision glass molding process is enabled to manufacture micro optical components made out of glass. In comparison to the existing glass molding technology the new approach aims for molding entire glass wafers including multiple micro optical components. It is explained which developments in the filed of simulation, mold manufacturing and molding were accomplished in order to enable the precision glass molding on wafer scale.

The Mechanical Properties of Platinum-Iridium Alloy Coating

2012 ◽  
Vol 486 ◽  
pp. 533-537 ◽  
Author(s):  
Hsi Hsin Chien ◽  
Kung Jeng Ma ◽  
Chien Hung Kuo
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Protective Coatings ◽  
Low Cost ◽  
Alloy Coating ◽  
Alloy Film ◽  
Molding Process ◽  
Optical Components ◽  
Alloy Films ◽  
Glass Molding

Glass molding process provides a great potential for the production of precise glass optical components at low cost. The platinum-iridium (Pt-Ir) alloys are widely used as the protective coatings to extend the service life of the mold in glass molding process. This study concentrated on the microstructure and mechanical properties of sputtered Pt-Ir alloy films. The obvious grain growth was observed in the Pt-Ir alloy films at sputtering temperature of 700. The hardness and elastic modulus of Pt-Ir alloy film decreased with the increase in Pt content.

Thermal modeling of wafer-based precision glass molding process

2016 ◽  
Author(s):  
Yang Hu ◽  
Lianguan Shen ◽  
Jian Zhou ◽  
Mujun Li
Keyword(s):  
Thermal Modeling ◽  
Molding Process ◽  
Glass Molding ◽  
Precision Glass Molding

scholarly journals A Comprehensive Review of Micro/Nano Precision Glass Molding Molds and Their Fabrication Methods

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 812
Author(s):  
Md. Ali Asgar ◽  
Jun Kim ◽  
Muhammad Refatul Haq ◽  
Taekyung Kim ◽  
Seok-min Kim
Keyword(s):  
Surface Roughness ◽  
Incident Light ◽  
Surface Finishing ◽  
Scattering Loss ◽  
Glass Molding ◽  
Glass Substrates ◽  
Precision Glass Molding ◽  
Wide Range ◽  
Mold Fabrication ◽  
Optical Applications

Micro/nano-precision glass molding (MNPGM) is an efficient approach for manufacturing micro/nanostructured glass components with intricate geometry and a high-quality optical finish. In MNPGM, the mold, which directly imprints the desired pattern on the glass substrate, is a key component. To date, a wide variety of mold inserts have been utilized in MNPGM. The aim of this article is to review the latest advances in molds for MNPGM and their fabrication methods. Surface finishing is specifically addressed because molded glass is usually intended for optical applications in which the surface roughness should be lower than the wavelength of incident light to avoid scattering loss. The use of molds for a wide range of molding temperatures is also discussed in detail. Finally, a series of tables summarizing the mold fabrication methods, mold patterns and their dimensions, anti-adhesion coatings, molding conditions, molding methods, surface roughness values, glass substrates and their glass transition temperatures, and associated applications are presented. This review is intended as a roadmap for those interested in the glass molding field.

scholarly journals Design and Fabrication of Low Cost Infrared Optical System Using Precision Glass Molding Lens Made by Chalcogenide Glass

2012 ◽  
Vol 23 (4) ◽  
pp. 154-158
Author(s):  
Seung Eun Oh ◽  
Sun Kyu Lee ◽  
Joong Kyu Choi ◽  
Kook Hyun Song ◽  
Jong Sik Baek
Keyword(s):  
Chalcogenide Glass ◽  
Optical System ◽  
Low Cost ◽  
Glass Molding ◽  
Precision Glass Molding

Design of Protective Coatings for Glass Lens Molding

2007 ◽  
Vol 364-366 ◽  
pp. 655-661 ◽  
Author(s):  
Kung Jeng Ma ◽  
H.H. Chien ◽  
W.H. Chuan ◽  
Choung Lii Chao ◽  
K.C. Hwang
Keyword(s):  
High Temperature ◽  
Protective Coatings ◽  
Optical Glass ◽  
Low Cost ◽  
Interface Reaction ◽  
Molding Process ◽  
Ceramic Substrates ◽  
Glass Molding ◽  
Operation Temperature ◽  
Glass Lens

The glass molding process is considered to have a great potential for the mass production of aspherical glass lenses with high precision and low cost. However, glass molding has a serious problem of mold sticking with glass which needs to be resolved. This research investigates the interface reaction between glass and mold by high temperature wetting experiment, which provides the reference for the designing anti-stick coatings. The SUMITA K-PSK200 optical glass gobs with low Tg were used in this study. The influence of operation temperature, ambient gas, substrate materials, and thin film composition on wettability of glass at high temperature were studied. The results show that the higher the temperature, the smaller the wetting angle between glass gob and substrate could be observed. This indicates that severe interface chemical reaction occured and resulted in the loss of transparency in glass appearance. The wetting experiment in nitrogen ambient improved the sticking situation. The combination of chemically stable substrates and coatings, such as Sapphire (substrate) / GaN (film) and Glass (substrate) / Al2O3 (film) can achieve the best antistick propose. The precious metal films, such as Pt, Ir, coated on the ceramic substrates can effectively reduce the interface reaction between the glass and substrates.

The Effect of TaN Interlayer on the Performance of Pt-Ir Protective Coatings in Glass Molding Process

2010 ◽  
Vol 297-301 ◽  
pp. 869-874 ◽  
Author(s):  
His Hsin Chien ◽  
Kung Jeng Ma ◽  
Chien Huang Kuo ◽  
Cheng Bang Huo ◽  
Choung Lii Chao ◽  
...  
Keyword(s):  
High Temperature ◽  
Diffusion Barrier ◽  
Precious Metal ◽  
Protective Coatings ◽  
Low Cost ◽  
Protective Layer ◽  
Diffusion Problem ◽  
Molding Process ◽  
Coating Materials ◽  
Glass Molding

The glass molding process provides great potential for mass production of precise glass optical components at low cost. The key issue for achieving a low production cost is to extend the service life of the expensive mold inserts. The precious metal based alloy is one of the coating materials for the molds which provides excellent glass anti-sticking results. However, the inter-diffusion between the WC/Co mold materials and precious metal coatings will deteriorate the coatings which needs to be resolved. It is essentially to deposit an interlayer as the diffusion barrier to improve the inter-diffusion problem. A thin layer of TaN was deposited on the WC/Co substrate as the diffusion barrier using a magnetron sputtering system, and followed by the deposition of Pt-Ir layer as the protective layer. Low Tg Glass gobs (L-BAL 42) were placed on the coated substrate to investigate inter-diffusion between the substrate and coating at high temperature. The surface interaction between the glass gobs and protective coatings was also examined. The obtained TaN and Pt-Ir multilayer had a dense nano-crystalline structure. High temperature wetting tests showed that the TaN film could effectively resist the cobalt and tungsten diffusion into the precious metal protective layer and, as a result, minimized the possibility of oxidation and interaction between glass and protective coating. The coated substrates retained a good surface finish and the glass gobs stayed fully transparent after 6 hours reaction test at 700°C.

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