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arxiv: 2510.00200 · v1 · submitted 2025-09-30 · ❄️ cond-mat.mtrl-sci

Influence of edge Laser-Induced Periodic Surface Structures (LIPSS) on the electrical properties of fs laser-machined ITO microcircuits

A. Frechilla , E. Mart\'inez , J. del Moral , C. L\'opez-Santos , J. Frechilla , F. Nu\~nez-G\'alvez , V. L\'opez-Flores , G.F. de la Fuente
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D. H\"ulag\"u J. Bonse A. R. Gonz\'alez-Elipe A. Borr\'as L.A. Angurel
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Pith reviewed 2026-05-18 11:06 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords LIPSSITO thin filmsfemtosecond lasermicrocircuitselectrical resistivitylaser machiningtransparent electrodesnanostructures
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The pith

LIPSS oriented perpendicular to ITO tracks raise electrical resistance by more than twofold with green femtosecond lasers.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines how laser-induced periodic surface structures form at the edges of femtosecond-machined ITO thin films and change the electrical performance of resulting microcircuits. It fabricates various circuit patterns with green and ultraviolet lasers to compare the effects of LIPSS orientation and periodicity on measured resistance. For green wavelength processing, tracks where LIPSS run perpendicular to the current path show resistance more than twice as high as those with parallel LIPSS. Ultraviolet processing instead produces clear thinning of the ITO layer where the LIPSS region meets the substrate. These observations matter because scalable laser machining is used to create microscale transparent electrodes whose conductivity must remain reliable for devices in optoelectronics and energy systems.

Core claim

The authors establish that LIPSS formed at the edges of micromachined ITO regions due to the Gaussian laser intensity profile alter conductivity in a wavelength-dependent manner: green femtosecond processing produces higher resistance by a factor just above two when LIPSS are oriented perpendicular rather than parallel to the ITO track, while ultraviolet processing produces a pronounced reduction in ITO thickness at the boundary between the LIPSS region and the underlying substrate.

What carries the argument

Edge LIPSS whose orientation and periodicity are set by laser wavelength and whose alignment relative to the circuit track controls the observed resistance increase.

If this is right

  • Microcircuit layouts must be aligned with the laser scan direction to keep LIPSS parallel to tracks and thereby limit resistance increases when using green lasers.
  • UV laser machining requires additional compensation for boundary thinning to preserve uniform film thickness across the circuit.
  • Electrical testing of laser-machined transparent electrodes must include orientation-specific checks because edge nanostructures dominate performance at micrometer scales.
  • Device integration that relies on laser subtractive manufacturing of TCOs will be constrained by the need to control LIPSS alignment for consistent conductivity.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same orientation dependence could be deliberately exploited to create integrated resistive elements within otherwise conductive ITO patterns.
  • At smaller circuit dimensions the relative contribution of these edge effects will grow, potentially limiting the minimum reliable feature size achievable by this method.
  • Comparable orientation-dependent resistance changes may occur in other transparent conductive oxides processed under similar femtosecond conditions.

Load-bearing premise

The observed resistance differences arise primarily from LIPSS orientation rather than from other unquantified laser-induced changes such as subsurface damage or material redeposition.

What would settle it

Fabricate matched ITO circuits with identical LIPSS periodicity but deliberately varied orientations, then measure resistance while separately quantifying subsurface damage depth and composition changes across the same samples.

Figures

Figures reproduced from arXiv: 2510.00200 by A. Borr\'as, A. Frechilla, A. R. Gonz\'alez-Elipe, C. L\'opez-Santos, D. H\"ulag\"u, E. Mart\'inez, F. Nu\~nez-G\'alvez, G.F. de la Fuente, J. Bonse, J. del Moral, J. Frechilla, L.A. Angurel, V. L\'opez-Flores.

Figure 1
Figure 1. Figure 1: FESEM micrographs (in lens detector) of the sample surface after having applied 1 or 10 laser pulses in a given position with (a) λ = 515 nm radiation and Ep = 6.55 µJ and (b) λ = 343 nm and Ep = 3.40 µJ. The substrate appears in black contrast in the images. The laser beam polarization direction lays almost parallel to the horizontal direction in all these images. 3.1. Nanostructures at the transition zon… view at source ↗
Figure 2
Figure 2. Figure 2: Top-view FESEM (SE) images of the edge of an ITO track micro-machined with 515 nm fs-laser wavelength: (a) LIPSS perpendicular to the electric track. (b) LIPSS parallel to the track. The original ITO and the glass substrate appear on the left- and right-hand sides of the micrographs, respectively. The top row panels provide overview images, while the bottom row ones display higher magnification images of t… view at source ↗
Figure 3
Figure 3. Figure 3: Analysis of the spatial periodicity evolution along the ITO/glass boundary for λ = 515 nm: Top￾view SEM image (a) showing the position ranges of the x-coordinate (in µm) that define the different sections analysed by 2D-FFT. (b) Central 1D-profiles perpendicular to the HSFL ridge direction of the 2D-FFT images, used to quantify the mean spatial periodicity of the LIPSS in different sectors of the transitio… view at source ↗
Figure 4
Figure 4. Figure 4: The image corresponds to an ITO track edge machined with 515 nm [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: TEM cross-sectional views of the nanotextured ITO layer at a lateral position near the unaffected pristine film (left) upon machining with 515 nm laser wavelength (HSFL-I parallel to the ITO track): (Top) Low-magnification HAADF-STEM. The vertical orange line indicates the thickness of the pristine ITO layer. (Bottom) HRTEM images taken at higher magnification at the indicated positions (1 – 3). 3.2. Nanos… view at source ↗
Figure 5
Figure 5. Figure 5: Top-view FESEM (SE) images of the boundaries between the ITO track and the glass after having applied the laser micromachining treatment with λ = 343 nm: (a) LIPSS perpendicular to the path. (b) LIPSS parallel to the path. The original ITO surface appears on the left-hand side of the micrographs, and the glass substrate (black contrast) on the right-hand one. The top row provides overview images, while the… view at source ↗
Figure 6
Figure 6. Figure 6: TEM cross-sectional views of the nanotextured ITO layer at a lateral position near the unaffected pristine film (left) upon machining with 343 nm fs-laser wavelength (LIPSS parallel to the ITO path): (Top) Low-magnification HAADF-STEM. The vertical orange line indicates the thickness of the pristine ITO film. (Bottom) HRTEM images taken at higher magnification at the indicated positions. The above top-view… view at source ↗
Figure 7
Figure 7. Figure 7: WDS microanalysis of the ITO films near the micromachined paths using: (a) λ = 515 nm and (b) λ = 343 nm laser wavelengths. The original ITO and the glass substrate appear in the left- and right￾hand sides of the images and graphs, respectively. LIPSS are parallel to the ITO paths in both cases. Top row panels: SEM (SE) images of the analysed areas. Middle row panels: Corresponding WDS maps of In concentra… view at source ↗
Figure 8
Figure 8. Figure 8: FESEM (SE) images of four ITO tracks machined with different configurations: (a) 515 nm, LIPSS parallel and LIPSS perpendicular, (b) 343 nm, LIPSS parallel and LIPSS perpendicular. Colour segments correspond to the differentiated regions by their nanostructure characteristics: “original” (red), “dense LIPSS” (green) and “isolated LIPSS” (orange). The track width is around 40 – 45 µm for all configurations.… view at source ↗
Figure 9
Figure 9. Figure 9: shows the ratio between R0 and Rmeas, for varying track widths, 𝑤୲୰ୟୡ୩ = 𝑤଴ + 2 · 𝑤୐, in the four analysed configurations. It is seen that these values follow the expected trend according to the proposed model, as shown in Equation (4). 𝑅଴ 𝑅୫ୣୟୱ = 1 + 1 𝛼 · 2𝑤୐ 𝑤଴ = 1 + 1 𝛼 · 2𝑤୐ 𝑤୲୰ୟୡ୩ − 2𝑤୐ (4) [PITH_FULL_IMAGE:figures/full_fig_p013_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Top-view FESEM (inlens) images of narrow ITO tracks (bright regions) micromachined with (a) 515 nm and b) 343 nm laser wavelengths, both with LIPSS perpendicular to the track. The segment in (b) marks the average width (3.5 µm) of the pristine ITO area. (c) Measured resistance for tracks of different widths, using a distance between voltage contacts of ≈ 60 μm. 3.5. Fabrication of electrical circuits Base… view at source ↗
Figure 11
Figure 11. Figure 11: Photograph (left), 3D topography (right top) and corresponding 1D cross-sectional profile (right bottom) in a circuit with 12 paths machined with the fs-UV (343 nm) laser wavelength. These results evidence that this technology has a great potential in the industrial realm. It has been demonstrated that, in addition to precise control over all variables of laser micromachining, scalability can be achieved,… view at source ↗
read the original abstract

Scalable and cost-effective methods for processing transparent electrodes at the microscale are transversal for advancing in electrochemistry, optoelectronics, microfluidics, and energy harvesting. In these fields, the precise fabrication of micrometric circuits plays a critical role in determining device performance and integration with added-value substrates. In this context, Laser Subtractive Manufacturing stands out among microfabrication techniques for its adaptability to diverse materials and complex configurations, as well as its straightforward scalability and affordability nature. However, a challenge in micromachining metals and metal oxides is the inherent formation of LIPSS, which can significantly impair electrical conductivity, particularly when circuit dimensions fall within the micrometer range. Herein, we investigate the micromachining of TCOs using ultrashort pulse laser systems applied to ITO thin films. We analyze the formation of LIPSS at the edges of the micromachined regions associated with the Gaussian distribution of the energy within the laser spot and their impact on the electrical properties depending on the circuit characteristics. Thus, we evaluate the influence of LIPSS orientation and periodicity by fabricating various circuit patterns using femtosecond lasers at green (515 nm) and ultraviolet (343 nm) wavelengths. A correlation between electrical resistivity measurements and structural analysis reveals distinct effects of nanostructure formation depending on the laser source. For green wavelength, the regions where LIPSS are oriented perpendicular to the ITO track exhibit higher resistance, by a factor just above two, compared to those where LIPSS are parallel. Additionally, UV laser processing results in a pronounced reduction of ITO thickness at the boundary between the LIPSS region and the substrate.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 1 minor

Summary. The manuscript investigates the formation of edge Laser-Induced Periodic Surface Structures (LIPSS) during femtosecond laser machining of ITO thin films and their effects on the electrical resistivity of fabricated microcircuits. Using 515 nm and 343 nm lasers, the authors fabricate various patterns and report a correlation between resistivity and structural analysis, specifically that perpendicular LIPSS orientations yield resistance higher by a factor just above two compared to parallel orientations for the green wavelength, while UV processing produces notable ITO thickness reduction at LIPSS-substrate boundaries.

Significance. If the reported resistance difference is causally linked to LIPSS orientation rather than confounding laser effects, the result would be relevant for optimizing laser subtractive manufacturing of transparent conductive oxides in microscale devices for optoelectronics, electrochemistry, and related fields. The comparative use of two wavelengths and focus on edge effects in micrometer-scale tracks provides practical guidance for minimizing conductivity losses, though additional controls would be needed to confirm the mechanism.

major comments (1)
  1. [Abstract] Abstract: the central claim that LIPSS orientation (perpendicular vs. parallel) produces a resistance ratio just above two for 515 nm processing is load-bearing, yet the manuscript provides no separate quantification or comparison of ITO thickness, composition, or subsurface damage between the two orientations despite noting the Gaussian beam profile; without this, direction-dependent ablation or redeposition effects remain plausible alternative explanations for the observed difference.
minor comments (1)
  1. The abstract would benefit from brief mention of sample size, measurement repeatability, or error estimates on the resistance values to aid reader assessment of the factor-of-two claim.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive and detailed review of our manuscript on the influence of edge LIPSS on the electrical properties of fs laser-machined ITO microcircuits. We have addressed the major comment below and describe the revisions planned for the next version.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim that LIPSS orientation (perpendicular vs. parallel) produces a resistance ratio just above two for 515 nm processing is load-bearing, yet the manuscript provides no separate quantification or comparison of ITO thickness, composition, or subsurface damage between the two orientations despite noting the Gaussian beam profile; without this, direction-dependent ablation or redeposition effects remain plausible alternative explanations for the observed difference.

    Authors: We thank the referee for identifying this important point that requires clarification. The LIPSS orientation is varied by changing the relative angle between the laser scan direction, polarization, and the long axis of the microcircuit track while keeping fluence, repetition rate, and spot size identical; the Gaussian profile therefore affects both cases similarly at the edges. Nevertheless, we agree that without explicit side-by-side quantification, direction-dependent ablation or redeposition cannot be ruled out as contributing factors. In the revised manuscript we will add AFM height profiles and cross-sectional SEM images that directly compare ITO thickness, edge morphology, and any visible subsurface modification or redeposited material for the perpendicular versus parallel LIPSS configurations. These new data will be presented in a dedicated supplementary figure and discussed in the results section to support that the observed resistance ratio arises primarily from the anisotropic disruption of current paths by the LIPSS rather than from differences in material removal. We will also revise the abstract wording if the added measurements alter the emphasis. revision: yes

Circularity Check

0 steps flagged

No significant circularity in experimental study

full rationale

This paper is a purely experimental materials science study reporting femtosecond laser machining of ITO thin films, resistance measurements on microcircuits, and correlation with LIPSS orientations and periodicity observed through structural microscopy. No equations, derivations, fitted parameters, or theoretical models are presented that could reduce by construction to inputs, self-definitions, or self-citation chains. The central claims rest on direct empirical comparisons between green and UV laser processing conditions, making the work self-contained against external benchmarks with no load-bearing circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central observations rest on standard assumptions in laser-material interaction and four-point probe resistivity measurement; no free parameters or invented entities are introduced.

axioms (1)
  • domain assumption LIPSS formation is an inherent consequence of the Gaussian energy distribution in ultrashort-pulse laser machining of metal oxides.
    Invoked in the abstract as the source of edge nanostructures whose electrical impact is being measured.

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    Bundesanstalt für Materialforschung und –prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany High-resolution electrical measurements with the 4-point microprobe station High-resolution measurements were performed in a 4-point probe configuration with a contact spacing of 60 µm, as illustrated in Figure S1. Figure S1. High-resolution FESEM image of t...

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