Demonstration of a PDMS based hybrid grating and Fresnel lens (G-Fresnel) device

Yang, Chuan; Shi, Kebin; Edwards, Perry S.; Liu, Zhiwen

doi:10.1364/oe.18.023529

Cited by 50 publications

(20 citation statements)

References 7 publications

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“…Yang et al 15 have demonstrated a G-Fresnel device based on double side grating formation on PDMS, which has dual functionality operating as diffraction grating and as Fresnel lens and can be integrated as an optofluidic device for on-chip spectroscopy.…”

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confidence: 99%

Vectorial strain gauge method using single flexible orthogonal polydimethylsiloxane gratings

Guo

Tang

Qian

et al. 2016

Sci Rep

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A vectorial strain gauge method using a single sensing element is reported based on the double-sided polydimethylsiloxane (PDMS) Fraunhofer diffraction gratings structures. Using O2 plasma treatment steps, orthogonal wrinkled gratings were fabricated on both sides of a pre-strained PDMS film. Diffracted laser spots from this structure have been used to experimentally demonstrate, that any applied strain can be quantitatively characterized in both the x and y directions with an error of less than 0.6% and with a gauge factor of approximately 10. This simple and low cost technology which is completely different from the traditional vectorial strain gauge method, can be applied to surface vectorial strain measurement and multi-axis integrated mechanical sensors.

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mentioning

confidence: 99%

Vectorial strain gauge method using single flexible orthogonal polydimethylsiloxane gratings

Guo

Tang

Qian

et al. 2016

Sci Rep

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“…Developing these capabilities is critical for enabling POC applications that demand high accuracy in measurements at low cost. In the past several years, G-Fresnel, a diffractive optical element with the dual functionality of focusing and dispersion has been developed for implementing miniaturized high-resolution optical spectrometers 32 – 35 . A transmission G-Fresnel, as used in this work, can be fabricated via soft lithography, by sandwiching polydimethylsiloxane (PDMS) prepolymer between a negative Fresnel lens mold and a grating mold 35 .…”

Section: Introductionmentioning

confidence: 99%

Smartphone based optical spectrometer for diffusive reflectance spectroscopic measurement of hemoglobin

Edwards

Zhang

et al. 2017

Sci Rep

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We report a miniature, visible to near infrared G-Fresnel spectrometer that contains a complete spectrograph system, including the detection hardware and connects with a smartphone through a microUSB port for operational control. The smartphone spectrometer is able to achieve a resolution of ~5 nm in a wavelength range from 400 nm to 1000 nm. We further developed a diffuse reflectance spectroscopy system using the smartphone spectrometer and demonstrated the capability of hemoglobin measurement. Proof of concept studies of tissue phantoms yielded a mean error of 9.2% on hemoglobin concentration measurement, comparable to that obtained with a commercial benchtop spectrometer. The smartphone G-Fresnel spectrometer and the diffuse reflectance spectroscopy system can potentially enable new point-of-care opportunities, such as cancer screening.

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“…This kind of optical combination is currently unused in solar concentration; however, it has already been proposed for other applications as a spectrometer [5], in this case with a diffractive Fresnel lens. We will here adapt the idea to the field of solar concentration using a refractive lens to avoid the strong spectral response of diffractive lenses.…”

Section: Introductionmentioning

confidence: 99%

Optical study of diffraction grating/Fresnel lens combinations applied to a spectral-splitting solar concentrator for space applications

Michel

Loicq²,

Thibert³

et al. 2015

Appl. Opt.

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This paper presents a new design of a planar solar concentrator with spectral splitting of light for space applications. This concentrator spectrally splits the incident light into mainly two parts. Each part is then focused onto specific spatially separated photovoltaic cells allowing for independent control of respective cells' output power. These advantages of both spectral splitting and light focusing are combined here because of a specific diffraction grating superimposed on a Fresnel lens. The theoretical principle of the optical design is presented with optimization of each element and improvement steps including optimization of grating period evolution along the lens and testing of two kinds of gratings (a blazed and a lamellar one). First numerical results are presented highlighting the possibility to design a concentrator at about 10× or more for each cell with an output power larger than that of a classical concentrator focusing on a GaAs single junction cell and less than 10% of losses for tracking errors up to ±0.8°. Some experimental results are also presented.

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Demonstration of a PDMS based hybrid grating and Fresnel lens (G-Fresnel) device

Cited by 50 publications

References 7 publications

Vectorial strain gauge method using single flexible orthogonal polydimethylsiloxane gratings

Vectorial strain gauge method using single flexible orthogonal polydimethylsiloxane gratings

Smartphone based optical spectrometer for diffusive reflectance spectroscopic measurement of hemoglobin

Optical study of diffraction grating/Fresnel lens combinations applied to a spectral-splitting solar concentrator for space applications

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