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arxiv: 2605.20927 · v1 · pith:JMNRWNSMnew · submitted 2026-05-20 · ⚛️ physics.optics · cond-mat.mes-hall

Spin-polarized lasing in a photonic lattice

A. Herrero Otermin , N. Carlon Zambon , A. Bieganowska , F. Jabeen , L. Vi\~na , C. Ant\'on-Solanas This is my paper

Pith reviewed 2026-05-21 02:38 UTC · model grok-4.3

classification ⚛️ physics.optics cond-mat.mes-hall
keywords photonic latticespin-polarized lasingmicrocavitycircular polarizationspatial coherenceVCSELGaAs
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The pith

A photonic lattice in a GaAs microcavity produces photon lasing with circular polarization that matches the handedness of the nonresonant pump.

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

The paper establishes that a two-dimensional lattice of coupled optical modes can support a transition to photon lasing while preserving controllable spin polarization from the excitation. Measurements under circularly polarized pumping show the output light acquiring matching circular polarization together with spatial coherence spanning multiple lattice cells. A sympathetic reader cares because this combines polarization control with an extended, scalable structure that does not require resonant pumping. If the observations hold, the lattice offers a concrete route to coherent sources in which the spin degree of freedom of the pump is transferred directly to the lasing emission.

Core claim

Under circularly polarized nonresonant excitation, the emitted light acquires a controllable circular polarization whose handedness follows that of the pump, accompanied by extended spatial coherence across several lattice unit cells during the transition to photon lasing.

What carries the argument

The staggered arrangement of rounded rectangular micrometric mesas that laterally confine and couple the optical modes.

If this is right

  • Photonic-lattice VCSELs function as a platform for spin-controlled coherent emission in extended optical systems.
  • The handedness of the lasing output is set by the circular polarization of the nonresonant pump.
  • Spatial coherence of the lasing mode extends across several lattice unit cells.

Where Pith is reading between the lines

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

  • The same lattice geometry could be tested with linear pump polarization to check whether orthogonal polarization states are also transferred.
  • Coupling this design to additional cavities might allow spin-selective lasing over still larger areas.
  • The approach suggests a path to nonresonant spin lasers that avoids the need for resonant excitation of specific modes.

Load-bearing premise

The measurements accurately distinguish the photon lasing regime from residual strong-coupling effects and the observed polarization transfer is not dominated by sample-specific depolarization or excitation artifacts.

What would settle it

If the output circular polarization handedness fails to track the pump handedness once the system enters the photon lasing regime, or if coherence remains confined to single unit cells, the central claim would be refuted.

Figures

Figures reproduced from arXiv: 2605.20927 by A. Bieganowska, A. Herrero Otermin, C. Ant\'on-Solanas, F. Jabeen, L. Vi\~na, N. Carlon Zambon.

Figure 1
Figure 1. Figure 1: Sample design and simulated band structure of the staggered square lattice. (a) Schematic of the semiconductor microcavity used in this work. The structure consists of a 𝜆-thick GaAs cavity formed by two GaAs/AlAs distributed Bragg reflectors (20 and 24 DBR pairs) embedding a single In0.06Ga0.94As QW. The cavity spacer is patterned into a staggered square lattice of micrometer-scale mesas (∼ 2 × 3 𝜇m2 ) co… view at source ↗
Figure 2
Figure 2. Figure 2: Nonlinear input-output response. (a–c) Energy- and momentum-resolved emission of the system as a function of increasing excitation power. (a) Low-density regime, showing the lower (LP) and upper (UP) polariton branches. The dashed white line in panel (a) indicates the exciton energy at 1.465 ± 0.001 eV. (b) Transition to the weak-coupling regime and onset of stimulated emission. (c) VCSEL regime. The arrow… view at source ↗
Figure 3
Figure 3. Figure 3: Spatial coherence via Michelson interferometry in an extended lattice. Real space emission and 𝑔 (1) measured in the polariton gas regime (a,b) and in the strong-coupling regime with a power of 0.29𝑃th and (c,d) VCSEL regime with a power of 1.15𝑃th. The intensity distribution in panels (a,c) is normalized to unity. The real space map of 𝑔 (1) is extracted via off-axis holographic techniques [PITH_FULL_IMA… view at source ↗
Figure 4
Figure 4. Figure 4: Spin injection in a photonic staggered-square lattice. (a/b) Map of 𝑆0𝑆3 in the dispersion relation under 𝜎 ± excitation at a fixed pump power density of 𝑃 = 0.98𝑃th. The 𝑆0 intensity map has been normalized to unity (𝑆0) prior to the representation of the 𝑆0𝑆3 map, hence re-scaling its false color scale. The black rectangles in both panels indicate the region of interest where 𝑆3 is averaged for the data … view at source ↗
read the original abstract

We characterize spin-polarized lasing in a two-dimensional photonic lattice fabricated from a GaAs/InGaAs semiconductor microcavity sample. The lattice is defined by a staggered arrangement of rounded rectangular micrometric mesas that laterally confine and couple the optical modes. Polarization-, angle-, and energy-resolved micro-photoluminescence measurements reveal the transition from the strong-coupling regime to photon lasing, accompanied by extended spatial coherence across several lattice unit cells. Under circularly polarized nonresonant excitation, the emitted light acquires a controllable circular polarization whose handedness follows that of the pump. These results establish photonic-lattice VCSELs as a platform for spin-controlled coherent emission in extended optical 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 paper reports experimental characterization of spin-polarized lasing in a two-dimensional photonic lattice fabricated from a GaAs/InGaAs semiconductor microcavity. The lattice is formed by a staggered arrangement of rounded rectangular micrometric mesas that laterally confine and couple the optical modes. Polarization-, angle-, and energy-resolved micro-photoluminescence measurements are used to identify the transition from the strong-coupling regime to photon lasing, accompanied by extended spatial coherence across several lattice unit cells. Under circularly polarized nonresonant excitation, the emitted light acquires a controllable circular polarization whose handedness follows that of the pump. The results are presented as establishing photonic-lattice VCSELs as a platform for spin-controlled coherent emission in extended optical systems.

Significance. If the regime identification and polarization transfer hold, the result is significant because it demonstrates controllable circular polarization in the photon-lasing regime of an extended photonic lattice, with accompanying spatial coherence over multiple unit cells. This combines nonresonant spin injection with coherent emission in a scalable lattice geometry, offering a potential route to spin-controlled VCSEL arrays that operate beyond the strong-coupling limit. The work provides concrete experimental evidence via angle- and polarization-resolved spectra that could inform design of future spin-photonic devices.

major comments (1)
  1. [Results section on transition to photon lasing] The identification of the photon-lasing regime (central to attributing polarization transfer to population inversion rather than residual polariton effects) relies on qualitative features of angle-resolved spectra. Explicit power-dependent input-output curves, quantitative linewidth narrowing below the cavity linewidth, or dispersion data showing disappearance of lower/upper polariton branches are not reported, leaving open the possibility that the observed polarization follows the pump due to incomplete transition or sample-specific effects.
minor comments (2)
  1. [Abstract] The abstract states that spatial coherence extends 'across several lattice unit cells' but does not indicate the measurement method (e.g., Young's double-slit interference or Fourier-space analysis); a brief clarification would strengthen the claim.
  2. [Methods / Experimental setup] Notation for polarization degree (e.g., Stokes parameters or circular polarization ratio) should be defined explicitly when first introduced in the main text to avoid ambiguity in the polarization-resolved data.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for highlighting the importance of rigorously establishing the photon-lasing regime. We address the major comment below and have revised the manuscript to strengthen the evidence for the transition from strong coupling to photon lasing.

read point-by-point responses

  1. Referee: [Results section on transition to photon lasing] The identification of the photon-lasing regime (central to attributing polarization transfer to population inversion rather than residual polariton effects) relies on qualitative features of angle-resolved spectra. Explicit power-dependent input-output curves, quantitative linewidth narrowing below the cavity linewidth, or dispersion data showing disappearance of lower/upper polariton branches are not reported, leaving open the possibility that the observed polarization follows the pump due to incomplete transition or sample-specific effects.

    Authors: We acknowledge that the original manuscript relied primarily on qualitative changes in the angle-resolved spectra to identify the transition to photon lasing. To address this, we have added explicit power-dependent input-output curves (new Figure 3) that show the characteristic threshold behavior with superlinear intensity increase and a clear kink at the onset of lasing. We also include quantitative linewidth data demonstrating narrowing below the bare cavity linewidth above threshold. Supplementary dispersion plots at increasing pump powers have been added to show the progressive disappearance of the lower and upper polariton branches as the system enters the weak-coupling regime. These revisions confirm that the observed spin-polarized emission and extended coherence occur in the photon-lasing regime, supporting attribution to population inversion rather than residual polariton effects. We note that full power-dependent dispersion mapping across the entire Brillouin zone was constrained by integration time and sample stability, but the provided data sufficiently resolve the transition. revision: yes

Circularity Check

0 steps flagged

No circularity in experimental characterization paper

full rationale

This is an experimental paper reporting photoluminescence measurements on a photonic lattice under nonresonant excitation. No mathematical derivation chain, first-principles predictions, or equations are presented that could reduce to fitted inputs or self-citations. The transition to photon lasing and polarization transfer are characterized directly via angle-resolved spectra and coherence observations, with no load-bearing steps that equate outputs to inputs by construction. The work is self-contained against external benchmarks as a direct measurement study.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work is experimental and draws on standard assumptions from semiconductor microcavity physics and photonic crystal fabrication; no new free parameters or invented entities are introduced.

axioms (1)
  • domain assumption Semiconductor microcavities support a strong-coupling regime between excitons and photons that transitions to photon lasing at higher excitation.
    Invoked when describing the observed transition from strong-coupling regime to photon lasing.

pith-pipeline@v0.9.0 · 5668 in / 1275 out tokens · 57530 ms · 2026-05-21T02:38:49.120792+00:00 · methodology

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