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Optics, Volume 2, Issue 1

March 2021 - 6 articles

Cover Story: The present study aims to design the optimal anti-reflective (AR) engraving on the input-output apertures of a dielectric light-guide. We estimate AR efficiency by the transmittance level in the required wavelength range (Δλ/λ0 = 0.7). We consider dielectric light-guides possessing a high refractive index (Si), which reduces, on the one hand, the requirement to the angular characteristic of the source, but, on the other hand, complicates the reduction of the reflection level. Using nano-pins as engraving, we analyze such factors as packing density on the nano-elements on the aperture, the elements shape, and the possible effect of randomizing their parameters. The predicted level of transmittance is close to 99%, and the flatness (the standard deviation) in the required wavelength range is 0.2%. View this paper
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Articles (6)

  • Article
  • Open Access
3,780 Views
8 Pages
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Prophylactic Corneal Cross-Linking in Myopic Femtosecond Laser-Assisted In Situ Keratomileusis: Long-Term Visual and Refractive Outcomes

  • Federico Alonso-Aliste,
  • Jonatan Amián-Cordero,
  • Rahul Rachwani-Anil,
  • Concepción De-Hita-Cantalejo,
  • Davide Borroni,
  • Carlos Rocha-de-Lossada and
  • José-María Sánchez-González
Optics2021, 2(1), 55-62;https://doi.org/10.3390/opt2010006

15 March 2021

The purpose of our study was to evaluate the safety, effectiveness, predictability, and stability of myopic and astigmatic laser-assisted in situ keratomileusis (LASIK) with simultaneous prophylactic corneal cross-linking (CXL) in thin corneas. In to...

Full Article
  • Article
  • Open Access
1 Citations
2,976 Views
9 Pages
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Nature of Photoelectric Effect in a Ge-on-Si SPAD at Ultralow Energy in Incident Pulsed Laser Radiation

  • Valeri I. Kovalev
Optics2021, 2(1), 45-53;https://doi.org/10.3390/opt2010004

31 January 2021

The photoelectric effect in a Ge-on-Si single-photon avalanche detector (SPAD) at an ultralow energy in incident pulsed laser radiation is considered in the frame of the classical theory of the electrodynamics of continuous media. It is shown that th...

Full Article
  • Review
  • Open Access
97 Citations
17,217 Views
24 Pages
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Signal and Image Processing in Biomedical Photoacoustic Imaging: A Review

  • Rayyan Manwar,
  • Mohsin Zafar and
  • Qiuyun Xu
Optics2021, 2(1), 1-24;https://doi.org/10.3390/opt2010001

31 December 2020

Photoacoustic imaging (PAI) is a powerful imaging modality that relies on the PA effect. PAI works on the principle of electromagnetic energy absorption by the exogenous contrast agents and/or endogenous molecules present in the biological tissue, co...

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  • Article
  • Open Access
2,960 Views
18 Pages
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Optimising the AR Engraved Structure on Light-Guide Facets for a Wide Range of Wavelengths

  • Ioseph Gurwich,
  • Yakov Greenberg,
  • Kobi Harush and
  • Yarden Tzabari
Optics2021, 2(1), 25-42;https://doi.org/10.3390/opt2010002

31 December 2020

The present study is aimed at designing anti-reflective (AR) engraving on the input–output surfaces of a rectangular light-guide. We estimate AR efficiency, by the transmittance level in the angular range, determined by the light-guide. Using n...

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Optics - ISSN 2673-3269
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