A simple and wide-range refractive index measuring approach by using a sub-micron grating

Liu, Chunwei; Wu, Chun-Che; Lin, Sung-Chyr

doi:10.1063/1.4918326

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…The reason why many researchers use diffraction grating to measure RI is that the measured range of RI can vary widely when diffraction gratings are used. 8) In this paper, we suggest a simple and inexpensive method to measure RI based on transmission diffraction gratings. Diffraction gratings have been fabricated by several optical fabrication methods including laser interference lithography 9,10) and fs-laser direct machining 11) and so on.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of uniform diffraction gratings using laser interference lithography for simultaneous measurement of refractive index

Lee

Park

et al. 2021

Jpn. J. Appl. Phys.

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sThe refractive index is one of the important optical properties. Many researchers have studied various methods of measuring refractive index. In this paper, we can easily measure the refractive index of liquids by using diffraction gratings fabricated by flat-top laser interference lithography. Using the diffraction grating for the measurement of the refractive index has the advantage of a wide measurement range. To fabricate the diffraction gratings, we suggest a special laser manufacturing method named flat-top laser interference lithography. The reason which we have chosen Flat-top laser interference lithography is that it can fabricate uniformly and large area micro/nanostructures on the substrate, using a 360 nm continuous-wave(C.W) laser. This optical system is an experiment in which micro/nanopatterning is performed by converting the Gaussian beam shape into a Flat-top shape and causing laser interference. We fabricated transmission diffraction grating on a glass wafer by flat-top laser interference lithography. The transmission diffraction grating is set to measure the refractive index of several liquids. When the laser is normally incident to the transmission diffraction grating, diffraction occurs then we set the beam-profiler, which can sense several optical properties, at 1st diffraction order. Depending on the type of liquid, 1st diffraction order may be displaced. We can easily measure this displacement and calculate the refractive index of liquids including water, benzene, and ethyl alcogol each value of 1.310, 1.501, and 1.3677. The calculated refractive index corresponds to the true values.

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Section: Introductionmentioning

confidence: 99%

Fabrication of uniform diffraction gratings using laser interference lithography for simultaneous measurement of refractive index

Lee

Park

et al. 2021

Jpn. J. Appl. Phys.

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“…However, most of those sensing approaches require sophisticated facilities including beam splitter, prism and spectrometers and so on. Hence, a variant of optical sensors that have been drawn significant attentions are based on the use of diffraction optical element (DOE) 12 – 14 . Kumawat et al .…”

Section: Introductionmentioning

confidence: 99%

Quasi-periodic concave microlens array for liquid refractive index sensing fabricated by femtosecond laser assisted with chemical etching

Zhang

Wang

Yin

et al. 2018

Sci Rep

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In this study, a high-efficiency single-pulsed femtosecond laser assisted with chemical wet etching method has been proposed to obtain large-area concave microlens array (MLA). The quasi-periodic MLA consisting of about two million microlenses with tunable diameter and sag height by adjusting laser scanning speed and etching time is uniformly manufactured on fused silica and sapphire within 30 minutes. Moreover, the fabricated MLA behaves excellent optical focusing and imaging performance, which could be used to sense the change of the liquid refractive index (RI). In addition, it is demonstrated that small period and high RI of MLA could acquire high sensitivity and broad dynamic measurement range, respectively. Furthermore, the theoretical diffraction efficiency is calculated by the finite domain time difference (FDTD) method, which is in good agreement with the experimental results.

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Diamond turning of high-precision roll-to-roll imprinting molds for fabricating subwavelength gratings

2016

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A simple and wide-range refractive index measuring approach by using a sub-micron grating

Cited by 5 publications

References 16 publications

Fabrication of uniform diffraction gratings using laser interference lithography for simultaneous measurement of refractive index

Fabrication of uniform diffraction gratings using laser interference lithography for simultaneous measurement of refractive index

Quasi-periodic concave microlens array for liquid refractive index sensing fabricated by femtosecond laser assisted with chemical etching

Diamond turning of high-precision roll-to-roll imprinting molds for fabricating subwavelength gratings

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