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Optics, Volume 1, Issue 2

2020 September - 4 articles

Cover Story: Alteration of aqueous pH is capable of unraveling the chemical reaction and biological activity. For probing aqueous pH in situ and precisely, an ultra-miniaturized optical pH probe is presented that exploits the microfiber Bragg grating. The Bragg reflection signal utilizes the wavelength shift to interrogate the refractive index change of the decorated functional layer, which harnesses the pH-dependent water absorption/expulsion strategy. With advantages, such as microneedle-like compact footprint, ease of fabrication, high portability, this proof-of-concept enriches the toolbox of pH sensors to cater to the need of detection in some extremely small spaces—for example, living cells or the bio-tissues. View this paper

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Articles (4)

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Review

15 Citations

7,331 Views

30 Pages

Optical Fibre Micro/Nano Tips as Fluorescence-Based Sensors and Interrogation Probes

Simone Berneschi,
Andrea Barucci,
Francesco Baldini,
Franco Cosi,
Franco Quercioli,
Stefano Pelli,
Giancarlo C. Righini,
Bruno Tiribilli,
Sara Tombelli and
Ambra Giannetti
+ 1 author

Optics2020, 1(2), 213-242;https://doi.org/10.3390/opt1020017

27 August 2020

Optical fibre micro/nano tips (OFTs), defined here as tapered fibres with a waist diameter ranging from a few microns to tens of nanometres and different tip angles (i.e., from tens of degrees to fractions of degrees), represent extremely versatile t...

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Article

13 Citations

4,224 Views

11 Pages

A Miniature pH Probe Using Functional Microfiber Bragg Grating

Yang Ran,
Peng Xiao,
Yongkang Zhang,
Deming Hu,
Zhiyuan Xu,
Lili Liang and
Bai-Ou Guan

Optics2020, 1(2), 202-212;https://doi.org/10.3390/opt1020016

11 August 2020

Operando and precisely probing aqueous pH is fundamentally demanded, both in chemical and biological areas. Conventional pH probes, subjected to the larger size, are probably unfit for application in some extreme scenarios, such as a trace amount of...

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Article

6 Citations

4,846 Views

11 Pages

Dispersion Management in 10-PW Laser Front End

Xingyan Liu,
Cheng Wang,
Xinliang Wang,
Xiaoming Lu,
Peile Bai,
Yanqi Liu,
Yanyan Li,
Keyang Liu,
Lianghong Yu and
Ruxin Li
+ 1 author

Optics2020, 1(2), 191-201;https://doi.org/10.3390/opt1020015

15 July 2020

To improve pulse contrast in chirped pulse amplification petawatt laser systems, the regenerative amplifier is substituted with a multipass amplifier at the Shanghai Superintense Ultrafast Laser Facility (SULF). To reduce the consequent angular dispe...

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Article

5,130 Views

16 Pages

A First Step towards Determining the Ionic Content in Water with an Integrated Optofluidic Chip Based on Near-Infrared Absorption Spectroscopy

Gerwin W. Steen,
Adam D. Wexler,
Elmar C. Fuchs and
Herman L. Offerhaus

Optics2020, 1(2), 175-190;https://doi.org/10.3390/opt1020014

11 July 2020

In this work, we present a feasibility study of integrated optofluidic chips to measure the ionic content in water using differential absorption spectroscopy. The second overtone of the OH-stretch vibration of water is used as indicator for both the...

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