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Micromachines
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Femtosecond Laser Micromachining for Photonics Applications, Volume II
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Femtosecond Laser Micromachining for Photonics Applications, Volume II

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (20 October 2021) | Viewed by 9785

Special Issue Editor

Dr. Giacomo Corrielli

E-Mail Website
Guest Editor
Istituto di Fotonica e Nanotecnologie - Consiglio Nazionale delle Ricerche (IFN-CNR) and Dipartimento di Fisica-Politecnico di Milano, Piazza Leonardo da Vinci, 32-20133 Milano, Italy
Interests: waveguide optics; femtosecond laser waveguide writing; integrated quantum photonics; quantum communications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Femtosecond lasers are a formidable micromachining tool, applicable to a variety of materials. In particular, femtosecond laser processing has unique capabilities to alter the optical properties of most transparent dielectric substrates in a permanent fashion and with a micrometric resolution, thus, allowing the manufacture of innovative integrated devices for photonics applications.

One important application of this technique is the direct and rapid inscription of integrated waveguide circuits with three-dimensional layouts. In the last decade, such circuits have found impressive applications in diverse fields, which include optical sensing, telecommunications, astrophotonics, and quantum photonics. Femtosecond laser pulses have also been exploited to locally engineer the birefringence of substrates and to produce microstructured birefringent plates. Femtosecond laser nanostructuring at the diffraction limit further allows the inscription of gratings and photonic crystals, as well as dense optical storage of information.

The research community in this field is growing at a steady pace: Optical devices produced by this technology are increasing in complexity and novel ideas are continually being presented. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles on technological advances and novel applicative concepts of femtosecond laser micromachining, with a focus on optics and photonics.

Dr. Giacomo Corrielli
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Femtosecond laser micromachining
  • Femtosecond laser waveguide writing
  • Optical material processing
  • Integrated photonics
  • Birefringence engineering
  • Optical storage

Related Special Issue

Published Papers (3 papers)

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Research

10 pages, 2645 KiB  
Article
Femtosecond-Laser-Ablation Dynamics in Silicon Revealed by Transient Reflectivity Change
by Tao Feng, Gong Chen, Hainian Han and Jie Qiao
Micromachines 2022, 13(1), 14; https://doi.org/10.3390/mi13010014 - 23 Dec 2021
Cited by 12 | Viewed by 3778
Abstract
The dynamics of ablation in monocrystalline silicon, from electron-hole plasma generation to material expansion, upon irradiation by a single femtosecond laser pulse (1030 nm, 300 fs pulse duration) at a wide range of fluences is investigated using a time-resolved microscopy technique. The reflectivity [...] Read more.
The dynamics of ablation in monocrystalline silicon, from electron-hole plasma generation to material expansion, upon irradiation by a single femtosecond laser pulse (1030 nm, 300 fs pulse duration) at a wide range of fluences is investigated using a time-resolved microscopy technique. The reflectivity evolution obtained from dynamic images in combination with a theoretical Drude model and a Two-Temperature model provides new insights on material excitation and ablation process. For all fluences, the reflectivity increased to a temporary stable state after hundreds of femtoseconds. This behavior was predicted using a temperature-dependent refractive index in the Drude model. The increase in velocity of plasma generation with increasing fluence was theoretically predicted by the Two-Temperature model. Two ablation regimes at high fluences (>0.86 J/cm2) were identified through the measured transient reflectivity and ablation crater profile. The simulation shows that the fluence triggering the second ablation regime produces a boiling temperature (silicon, 2628 K). Full article
(This article belongs to the Special Issue Femtosecond Laser Micromachining for Photonics Applications, Volume II)
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10 pages, 2703 KiB  
Article
Phase-Type Fresnel Zone Plate with Multi-Wavelength Imaging Embedded in Fluoroaluminate Glass Fabricated via Ultraviolet Femtosecond Laser Lithography
by Qisong Li, Xuran Dai, Haosong Shi, Yi Liu and Long Zhang
Micromachines 2021, 12(11), 1362; https://doi.org/10.3390/mi12111362 - 4 Nov 2021
Cited by 5 | Viewed by 2116
Abstract
Herein, we report a novel optical glass material, fluoroaluminate (AlF3) glass, with excellent optical transmittance from ultraviolet to infrared wavelength ranges, which provides more options for application in optical devices. Based on its performance, the phase-type Fresnel zone plate (FZP) by [...] Read more.
Herein, we report a novel optical glass material, fluoroaluminate (AlF3) glass, with excellent optical transmittance from ultraviolet to infrared wavelength ranges, which provides more options for application in optical devices. Based on its performance, the phase-type Fresnel zone plate (FZP) by ultraviolet femtosecond (fs) laser-inscribed lithography is achieved, which induces the refractive index change by fs-laser tailoring. The realization of ultraviolet fs-laser fabrication inside glass can benefit from the excellent optical performance of the AlF3 glass. Compared with traditional surface-etching micro-optical elements, the phase-type FZP based on AlF3 glass exhibits a clear and well-defined geometry and presents perfect environmental suitability without surface roughness problems. Additionally, optical focusing and multi-wavelength imaging can be easily obtained. Phase-type FZP embedded in AlF3 glass has great potential applications in the imaging and focusing in glass-integrated photonics, especially for the ultraviolet wavelength range. Full article
(This article belongs to the Special Issue Femtosecond Laser Micromachining for Photonics Applications, Volume II)
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16 pages, 10220 KiB  
Article
Morphological Study of Nanostructures Induced by Direct Femtosecond Laser Ablation on Diamond
by Ahmed Abdelmalek, Argyro N. Giakoumaki, Vibhav Bharadwaj, Belén Sotillo, Thien Le Phu, Monica Bollani, Zeyneb Bedrane, Roberta Ramponi, Shane M. Eaton and Malik Maaza
Micromachines 2021, 12(5), 583; https://doi.org/10.3390/mi12050583 - 20 May 2021
Cited by 3 | Viewed by 3069
Abstract
High spatial frequency laser induced periodic surface structure (HSFL) morphology induced by femtosecond laser with 230 fs pulse duration, 250 kHz repetition rate at 1030 nm wavelength on CVD diamond surface is investigated and discussed. The spatial modification was characterized and analyzed by [...] Read more.
High spatial frequency laser induced periodic surface structure (HSFL) morphology induced by femtosecond laser with 230 fs pulse duration, 250 kHz repetition rate at 1030 nm wavelength on CVD diamond surface is investigated and discussed. The spatial modification was characterized and analyzed by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and 2D-Fast Fourier Transform (2D-FFT). We studied the effect of pulse number and laser power on the spatial development of nanostructures, and also deduced the impact of thermal accumulation effect on their morphology. A generalized plasmonic model has been used to follow the optical evolution of the irradiated surface and to determine the periodic value of the nanostructures. We suggest that non-thermal melting and plasmonic excitation are the main processes responsible for the formation of HSFL-type nanostructures. Full article
(This article belongs to the Special Issue Femtosecond Laser Micromachining for Photonics Applications, Volume II)
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