Lens of controllable optical field with thin film metallic glasses for UV-LEDs

Pan, C. T.; Chen, Y. C.; Lin, Po‐Hung; Hsieh, Chia‐Hsu; Hsu, Feng-Hao; Chang, C. M.; Hsu, Jui-Hung; Huang, J.C.

doi:10.1364/oe.22.014411

Cited by 14 publications

(4 citation statements)

References 13 publications

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“…Another characteristic of this elastomer is its biocompatibility, which means that PDMS is compatible with biologic tissues [ 49 ]. PDMS presents a transmittance up to 90% for the wavelength from 390 nm to 780 nm [ 51 , 52 , 53 ] and, due to this characteristic, PDMS-based microsystems allow the direct observation of the mimicked blood flow inside the mimicked vessels and the integration of optical detection systems, hence playing an important role in this field.…”

Section: Pdms Propertiesmentioning

confidence: 99%

Properties and Applications of PDMS for Biomedical Engineering: A Review

Miranda

Souza

Sousa

et al. 2021

JFB

267

170

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Polydimethylsiloxane (PDMS) is an elastomer with excellent optical, electrical and mechanical properties, which makes it well-suited for several engineering applications. Due to its biocompatibility, PDMS is widely used for biomedical purposes. This widespread use has also led to the massification of the soft-lithography technique, introduced for facilitating the rapid prototyping of micro and nanostructures using elastomeric materials, most notably PDMS. This technique has allowed advances in microfluidic, electronic and biomedical fields. In this review, an overview of the properties of PDMS and some of its commonly used treatments, aiming at the suitability to those fields’ needs, are presented. Applications such as microchips in the biomedical field, replication of cardiovascular flow and medical implants are also reviewed.

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Section: Pdms Propertiesmentioning

confidence: 99%

Properties and Applications of PDMS for Biomedical Engineering: A Review

Miranda

Souza

Sousa

et al. 2021

JFB

267

170

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“…Due to its elastic properties, PDMS can withstand up to 140% reversible stretch depending upon its thickness [55]. This organosilicon material offers a good transparency (up to 90%) in a wide spectral range (350-950 nm) which proves its feasibility in examining the mechanical strain by optical methods [56,57].…”

Section: Introductionmentioning

confidence: 91%

Mechanically Tunable Flexible Photonic Device for Strain Sensing Applications

2023

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Flexible photonic devices based on soft polymers enable real-time sensing of environmental conditions in various industrial applications. A myriad of fabrication techniques have been established for producing optical devices, including photo and electron-beam lithography, nano/femtosecond laser writing, and surface imprinting or embossing. However, among these techniques, surface imprinting/embossing is simple, scalable, convenient to implement, can produce nanoscale resolutions, and is cost-effective. Herein, we utilize the surface imprinting method to replicate rigid micro/nanostructures onto a commonly available PDMS substrate, enabling the transfer of rigid nanostructures into flexible forms for sensing at a nanometric scale. The sensing nanopatterned sheets were mechanically extended, and the extension was remotely monitored via optical methods. Monochromatic light (450, 532, and 650 nm) was transmitted through the imprinted sensor under various force/stress levels. The optical response was recorded on an image screen and correlated with the strain created by the applied stress levels. The optical response was obtained in diffraction pattern form from the flexible grating-based sensor and in an optical-diffusion field form from the diffuser-based sensor. The calculated Young’s modulus in response to the applied stress, measured through the novel optical method, was found in a reasonable range compared to the reported range of PDMS (360–870 kPa) in the literature.

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“…LED light source can be considered a Lambertian distribution, and the light emission of half intensity angle is 60 ∘ that affects the uniformity of light distribution on the target plane. A secondary optical uniform lens is fabricated to solve the problems and the uniformity can be enhanced by using this design [15,16]. The light distribution of a bare LED is Lambertian distribution, whose light distribution is defined as cosine exponential function of angle .…”

Section: Uniform Free-form Lensmentioning

confidence: 99%

Design of Elliptic Reflective LED Surgical Shadowless Lamps Using Mathematical Optical Tracing Algorithms

Pan

Chen

Yang

et al. 2014

Mathematical Problems in Engineering

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Traditional surgical shadowless halogen lamps are generally designed as projection type with many light bulbs, which can produce not only mercury pollution but also heat radiation that are serious problems to patient. The study utilized Runge-Kutta methods and mathematical algorithms to design and optimize the freeform lens. The LED (light-emitting diode) was adopted to replace the traditional halogen lamp. A uniform lens was designed and fabricated based on the energy conservation. At first, the light field of LED is concentrated through the freeform lens to improve the optical efficiency. Second, the three-shell elliptic curves are applied to the reflective surgical shadowless lamps, where only few LED chips are needed. Light rays emitting from different directions to the target plane can achieve the goal of shadowless. In this study, the LED's luminance flux is 1,895 lm. The shadow dilution on the target plane is 54%. (central illuminance) is 114,900 lux, and the 50 / 10 is 57% which is higher than the regulation by 7%, whereas the power consumption is only 20 W. The energy of reflective surgical shadowless lamps can save more than 50%, compared with the traditional projective one.

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Lens of controllable optical field with thin film metallic glasses for UV-LEDs

Cited by 14 publications

References 13 publications

Properties and Applications of PDMS for Biomedical Engineering: A Review

Properties and Applications of PDMS for Biomedical Engineering: A Review

Mechanically Tunable Flexible Photonic Device for Strain Sensing Applications

Design of Elliptic Reflective LED Surgical Shadowless Lamps Using Mathematical Optical Tracing Algorithms

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