pith. sign in

arxiv: 1906.11514 · v1 · pith:72O6TLDEnew · submitted 2019-06-27 · ⚛️ physics.app-ph · physics.optics

Coaxial nanowires as plasmon-mediated remote nanosensors

Daniel Funes-Hernando , Mario Pelaez-Fernandez , Dominik Winterauer , Jean-Yves Mevellec , Raul Arenal , Tim Batten , Bernard Humbert , Jean Luc Duvail This is my paper

Pith reviewed 2026-05-25 14:11 UTC · model grok-4.3

classification ⚛️ physics.app-ph physics.optics
keywords coaxial nanowiressurface plasmon polaritonsremote Raman sensinggold corePEDOT shellplasmon-mediated nanosensors
0
0 comments X

The pith

Coaxial nanowires with gold cores propagate plasmons to enable remote Raman sensing separated by micrometers.

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

This paper demonstrates that coaxial nanowires can achieve remote Raman sensing by separating the excitation laser spot from the detection point by several micrometers. A gold core carries surface plasmon polaritons that excite Raman emission from a polymer shell at the distant end. Fabrication controls the shell location to confirm the plasmon-mediated effect rather than direct illumination. The approach targets sensing of light-sensitive materials and integrated 1D photonic-plasmonic devices. Success hinges on efficient long-distance plasmon propagation in the core.

Core claim

Coaxial nanowires consisting in a gold core to propagate the surface plasmon polaritons and a Raman-emitting shell of poly(3,4-ethylene-dioxythiophene) enable plasmon-mediated remote Raman sensing with the excitation laser spot and Raman detection separated by several micrometers.

What carries the argument

The coaxial nanowire geometry using a gold core for surface plasmon polariton propagation and a controlled PEDOT shell for Raman emission.

If this is right

  • Remote detection of photo-degradable substances without direct laser exposure on the sample.
  • Exploration of 1D nanosources for integrated photonic and plasmonic systems.
  • Single-nanowire devices allowing spatial separation of excitation and sensing regions.

Where Pith is reading between the lines

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

  • The same geometry could support remote versions of other optical spectroscopies if plasmon intensity remains adequate.
  • Precise shell placement opens the possibility of position-selective sensing along one nanowire.
  • Core material or diameter variations might extend the usable separation distance beyond several micrometers.

Load-bearing premise

Surface plasmon polaritons propagate efficiently along the gold core over micrometer distances with sufficient intensity to excite detectable Raman emission from the distant polymer shell without direct optical leakage or artifacts bridging the separation.

What would settle it

Detecting Raman signal at the far tip even when the polymer shell is absent from that location or when the nanowire is physically broken midway would falsify plasmon mediation.

read the original abstract

This study reports on the plasmon-mediated remote Raman sensing promoted by specially designed coaxial nanowires. This unusual geometry for Raman study is based on the separation, by several micrometres, of the excitation laser spot, on one tip of the nanowire, and the Raman detection at the other tip. The very weak efficiency of Raman emission makes it challenging in a remote configuration. For the proof-of-concept, we designed coaxial nanowires consisting in a gold core to propagate the surface plasmon polaritons and a Raman-emitting shell of poly(3,4-ethylene-dioxythiophene). The success of the fabrication was demonstrated by correlating, for the same single nanowire, a morphological analysis by electron microscopy and Raman spectroscopy analysis. Importantly for probing remote-Raman effect, the original hard template-based process allows to control the location of the polymer shell all along the nanowire, or only close to one or the two nanowire tips. Such all-in-one single nanowires could have applications in the remote detection of photo-degradable substances and for exploring 1D nanosources for integrated photonic and plasmonic systems.

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 / 2 minor

Summary. The manuscript reports a proof-of-concept demonstration of plasmon-mediated remote Raman sensing in coaxial nanowires. A gold core propagates surface plasmon polaritons while a PEDOT shell provides the Raman emitter; excitation at one tip and detection at the other are separated by several micrometers. Fabrication via hard-template electrodeposition allows the polymer shell to be placed either along the full nanowire length or localized at one or both tips. Correlation of electron-microscopy morphology with Raman spectra on the same individual nanowires is presented as evidence that the structures were successfully realized.

Significance. A working remote-Raman geometry on a single nanowire would open routes to sensing of photo-degradable analytes and to compact 1D plasmonic sources. The template-controlled placement of the Raman-active shell supplies a built-in differential test that directly addresses the propagation-versus-leakage question, which is a methodological strength.

major comments (1)
  1. [Abstract] Abstract and main text: the central claim that SPPs propagate efficiently enough to produce detectable remote Raman emission is not yet supported by quantitative spectra, measured propagation lengths, signal-to-noise values, or explicit leakage controls. The fabrication controls are described but the optical data that would confirm the remote effect remain absent.
minor comments (2)
  1. Clarify the exact optical geometry (objective NA, spot size, collection path) used to ensure the excitation and collection spots are truly separated by the stated micrometer distance.
  2. Add scale bars and labeling to any SEM/TEM images that are correlated with the Raman maps so that the polymer location relative to the tips can be verified independently.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the detailed and constructive report. The primary concern raised is the absence of quantitative optical data supporting efficient SPP propagation and remote Raman detection. We agree this is a valid point and will strengthen the manuscript with additional analysis.

read point-by-point responses

  1. Referee: [Abstract] Abstract and main text: the central claim that SPPs propagate efficiently enough to produce detectable remote Raman emission is not yet supported by quantitative spectra, measured propagation lengths, signal-to-noise values, or explicit leakage controls. The fabrication controls are described but the optical data that would confirm the remote effect remain absent.

    Authors: We acknowledge that the current manuscript focuses on the template-based fabrication controls (full-length vs. tip-localized PEDOT shells) and the SEM-Raman correlation on the same nanowires, but does not provide the requested quantitative metrics. In the revised version we will add: (i) remote vs. local Raman spectra with explicit signal-to-noise values, (ii) estimates of propagation length derived from the observed micrometer-scale separation, and (iii) differential comparisons between full-shell and tip-only configurations to address leakage versus true propagation. These additions will directly support the central claim while preserving the methodological strength of the built-in controls already described. revision: yes

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper is a purely experimental proof-of-concept report describing fabrication of coaxial Au/PEDOT nanowires, electron microscopy correlation, and Raman measurements in remote tip-to-tip geometry. No equations, derivations, fitted parameters, predictions, or theoretical claims appear in the abstract or described content. No self-citations, ansatzes, or uniqueness theorems are invoked to support any load-bearing step. The central demonstration relies on direct experimental controls (polymer placement at tips vs. full length) that are independent of any internal reduction to inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The paper is an experimental demonstration relying on established principles of surface plasmon polaritons and Raman scattering; no additional free parameters, axioms beyond standard physics, or invented entities are introduced.

pith-pipeline@v0.9.0 · 5746 in / 1195 out tokens · 37821 ms · 2026-05-25T14:11:01.188769+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Reference graph

Works this paper leans on

12 extracted references · 12 canonical work pages

  1. [1]

    Enabling Excellence

    and maintained collection area (O) of the Raman signal plotted in (e) at 785 nm. (d2) Optical microscopy image without back light when exciting in 2 with a 785 nm laser. Scale bars are 2 μm. | 7 Please do not adjust margins Pl d t dj t i Acknowledgements This work was supported by the EU Marie Skłodowska‐Curie “Enabling Excellence” project 642742. The STE...

    work page 1999

  2. [2]

    Arenal, L

    9 R. Arenal, L. Henrard, L. Roiban, O. Ersen, J. Burgin and M. Treguer‐Delapierre, J. Phys. Chem. C, 2014, 118, 25643– 25650. 10 H. Y. Feng, F. Luo, R. Arenal, L. Henrard, F. García, G. Armelles and A. Cebollada, Nanoscale, 2016, 9, 37–44. 11 L. Billot, M. Lamy de la Chapelle, A.‐S. Grimault, A. Vial, D. Barchiesi, J.‐L. Bijeon, P.‐M. Adam and P. Royer, C...

    work page 2014

  3. [3]

    15 J. A. Hutchison, S. P. Centeno, H. Odaka, H. Fukumura, J. Hofkens and H. Uji‐i, Nano Lett., 2009, 9, 995–1001. 16 Y. Fang, H. Wei, F. Hao, P. Nordlander and H. Xu, Nano Lett., 2009, 9, 2049–2053. 17 Y. Huang, Y. Fang and M. Sun, J. Phys. Chem. C, 2011, 115, 3558–3561. 18 Y. Huang, Y. Fang, Z. Zhang, L. Zhu and M. Sun, Light Sci. Appl., 2014, 3, e199. 1...

    work page 2009

  4. [4]

    Arinstein, M

    23 A. Arinstein, M. Burman, O. Gendelman and E. Zussman, Nat. Nanotechnol., 2007, 2, 59–62. 24 L. M. Bellan and H. G. Craighead, Polymer, 2008, 49, 3125–

    work page 2007

  5. [5]

    Camposeo, I

    25 A. Camposeo, I. Greenfeld, F. Tantussi, S. Pagliara, M. Moffa, F. Fuso, M. Allegrini, E. Zussman and D. Pisignano, Nano Lett., 2013, 13, 5056–5062. 26 Z. Hu, C. Kong, Y. Han, H. Zhao, Y. Yang and H. Wu, Mater. Lett., 2007, 61, 3931–3934. 27 X. Ye, C. Zheng, J. Chen, Y. Gao and C. B. Murray, Nano Lett., 2013, 13, 765–771. 28 N. Jiang, L. Shao and J. Wan...

    work page 2013

  6. [6]

    Aldissi, J

    29 M. Aldissi, J. Polym. Sci. Part C Polym. Lett., 1989, 27, 105–110. 30 G. E. Possin, Rev. Sci. Instrum., 1970, 41, 772–774. 31 L. S. Van Dyke and C. R. Martin, Langmuir, 1990, 6, 1118–

    work page 1989

  7. [7]

    32 C. R. Martin, Science, 1994, 266, 1961–1966. 33 D. Routkevitch, T. Bigioni, M. Moskovits and J. M. Xu, J. Phys. Chem. A, 1996, 100, 14037–14047. 34 J. L. Duvail, P. Retho, S. Garreau, G. Louarn, C. Godon and S. Demoustier‐Champagne, Synth. Met., 2002, 131, 123–128. 35 J. L. Duvail, P. Rétho, V. Fernandez, G. Louarn, P. Molinié and O. Chauvet, J. Phys. ...

    work page 1994

  8. [8]

    Dogan, M

    44 Ü. Dogan, M. Kaya, A. Cihaner and M. Volkan, Electrochimica Acta, 2012, 85, 220–227. 45 W. Liang and C. R. Martin, J. Am. Chem. Soc., 1990, 112, 9666–

    work page 2012

  9. [9]

    46 Z. Cai, J. Lei, W. Liang, V. Menon and C. R. Martin, Chem. Mater., 1991, 3, 960–967. 47 S. Pagliara, M. S. Vitiello, A. Camposeo, A. Polini, R. Cingolani, G. Scamarcio and D. Pisignano, J. Phys. Chem. C, 2011, 115, 20399–20405. 48 C. R. Martin, Acc. Chem. Res., 1995, 28, 61–68. 49 Y. Shirai, S. Takami, S. Lasmono, H. Iwai, T. Chikyow and Y. Wakayama, J...

    work page 1991

  10. [10]

    Singh, T

    50 V. Singh, T. L. Bougher, A. Weathers, Y. Cai, K. Bi, M. T. Pettes, S. A. McMenamin, W. Lv, D. P. Resler, T. R. Gattuso, D. H. Altman, K. H. Sandhage, L. Shi, A. Henry and B. A. Cola, Nat. Nanotechnol., 2014, 9, 384–390. 51 M. Akimoto, Y. Furukawa, H. Takeuchi, I. Harada, Y. Soma and M. Soma, Synth. Met., 1986, 15, 353–360. 8 | Please do not adjust marg...

    work page 2014

  11. [11]

    Granström and O

    54 M. Granström and O. Inganäs, Polym. Pap., 1995, 36, 2867–

    work page 1995

  12. [12]

    55 J. L. Duvail, Y. Long, S. Cuenot, Z. Chen and C. Gu, Appl. Phys. Lett., 2007, 90, 102114. 56 R. M. Dickson and L. A. Lyon, J. Phys. Chem. B, 2000, 104, 6095–6098. 57 H. Ditlbacher, A. Hohenau, D. Wagner, U. Kreibig, M. Rogers, F. Hofer, F. R. Aussenegg and J. R. Krenn, Phys. Rev. Lett., 2005, 95, 257403. 58 Z. Li, F. Hao, Y. Huang, Y. Fang, P. Nordland...

    work page 2007