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Dear Colleagues,

I would like to invite you to submit your unpublished research work on any areas of micro- and nano-machining processes to this Special Issue. With the increasing trend of miniaturization and growth of micro-electro-mechanical systems (MEMS) and nano-electro-mechanical systems (NEMS) industries, micro- and nano-machining processes have become an integral area of advanced manufacturing processes. Micro- and nano-machining processes have found important applications in the field of sensors, photovoltaics, drug delivery, microfluidics, micro-mold fabrication, etc. Being able to machine a wide range of materials and geometry, micro- and nano-machining are found to play an important role where lithography-based micro and nanofabrication processes face challenges. Micro- and nano-machining processes can be tool-based or beam-based processes offering both contact and non-contact material removal mechanisms, and have their own advantages and limitations. Some of the tool-based micromachining includes micro-milling, micro-turning, and micro-grinding, whereas tool-based nanomachining processes are mostly based on scanning probe microscopy (SPM). Micro-electro-discharge machining (micro-EDM) and micro-electrochemical machining (micro-ECM) are two non-contact tool-based micromachining processes used for machining difficult-to-cut materials. Laser, electron beam, or ion-beam-based micro- and nano-machining processes are used extensively because of being faster processes and their capability of machining a wide range of materials.

The goal of this Special Issue is to encompass recent significant studies and advances in the areas of micro- and nano-machining processes using both beam- and tool-based processes. Experimental investigations, analytical modeling, and numerical simulations in the areas of micro- and nano-machining processes are of interest. Process development, monitoring, and control of various micro and nano-machining processes fall within the scope of this Special Issue. Specific topics of interest include, but are not limited to, the following:

Conventional micromachining processes, i.e., micro-turning, micro-milling, micro-grinding, etc.
Non-conventional micromachining processes, i.e., micro-EDM, micro-ECM, micro-ECDM, micro-AWJM, etc.
Hybrid and/or assistive micro-machining processes, i.e., combined laser and micro-EDM, simultaneous micro-ED and micro-ECM processes, etc.
Scanning probe-based nano-machining processes, i.e., AFM-based nano-machining, AFM or nano-indentation based patterning, nano-scratching, etc.
Beam-based micro- and nano-machining processes, i.e., fused-beam machining, electron-beam machining, laser-beam machining, etc.

Dr. Muhammad Pervej Jahan
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.

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Published Papers (1 paper)

Research

35 pages, 6792 KiB

Open AccessArticle

Usable Analytical Expressions for Temperature Distribution Induced by Ultrafast Laser Pulses in Dielectric Solids

by Ruyue Que, Matthieu Lancry and Bertrand Poumellec

Micromachines 2024, 15(2), 196; https://0-doi-org.brum.beds.ac.uk/10.3390/mi15020196 - 27 Jan 2024

Cited by 1 | Viewed by 717

Abstract

This paper focuses on the critical role of temperature in ultrafast direct laser writing processes, where temperature changes can trigger or exclusively drive certain transformations, such as phase transitions. It is important to consider both the temporal dynamics and spatial temperature distribution for the effective control of material modifications. We present analytical expressions for temperature variations induced by multi-pulse absorption, applicable to pulse durations significantly shorter than nanoseconds within a spherical energy source. The objective is to provide easy-to-use expressions to facilitate engineering tasks. Specifically, the expressions are shown to depend on just two parameters: the initial temperature at the center denoted as T₀₀ and a factor R_τ representing the ratio of the pulse period τ_p to the diffusion time τ_d. We show that temperature, oscillating between T_max and T_min, reaches a steady state and we calculate the least number of pulses required to reach the steady state. The paper defines the occurrence of heat accumulation precisely and elucidates that a temperature increase does not accompany systematically heat accumulation but depends on a set of laser parameters. It also highlights the temporal differences in temperature at the focus compared to areas outside the focus. Furthermore, the study suggests circumstances under which averaging the temperature over the pulse period can provide an even simpler approach. This work is instrumental in comprehending the diverse temperature effects observed in various experiments and in preparing for experimental setup. It also aids in determining whether temperature plays a role in the processes of direct laser writing. Toward the end of the paper, several application examples are provided. Full article

(This article belongs to the Special Issue Micro and Nano Machining Processes, 3rd Edition)

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