Reconfigurable Momentum-space vectorial lasing enabled by Quasi-BIC

Hongyu Yuan; Jiayao Liu; Xiaolin Wang; Zelong He; Zhaona Wang; Zhuoyang Li; Zimeng Zeng

arxiv: 2604.07670 · v1 · submitted 2026-04-09 · ⚛️ physics.optics · physics.app-ph

Reconfigurable Momentum-space vectorial lasing enabled by Quasi-BIC

Hongyu Yuan , Zimeng Zeng , Jiayao Liu , Zhuoyang Li , Xiaolin Wang , Zelong He , Zhaona Wang This is my paper

Pith reviewed 2026-05-10 17:43 UTC · model grok-4.3

classification ⚛️ physics.optics physics.app-ph

keywords reconfigurable laserquasi-BICphotonic crystalmomentum-space lasingvectorial polarizationbound states in the continuumoptical switchingdonut beam

0 comments

The pith

A photonic crystal laser achieves reversible switching between single-donut and double-lobe vectorial patterns by adjusting pump energy density.

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

The paper demonstrates that geometric asymmetry factors in a two-dimensional photonic crystal can selectively excite different quasi-BIC modes to produce distinct momentum-space vectorial lasing outputs. These include bidirectional double lobes alone or combined with radially polarized rings, azimuthally polarized rings, or linearly polarized spots. A reader would care because the same device can toggle reversibly between a single donut mode and a donut augmented with double lobes simply by changing pump strength, providing a compact route to dynamic light structuring without hardware swaps. The approach identifies the asymmetry values that favor single-BIC, dual-BIC, or radiative-with-BIC operation.

Core claim

By selectively exciting quasi-BIC modes through engineered geometric asymmetry factors in a two-dimensional photonic crystal, the authors achieve vectorial lasing with momentum-space patterns including bidirectional double lobes (BDL), radially polarized ring with BDL, azimuthally polarized ring with BDL, and linearly polarized spot with BDL. Reversible switching between a single donut and a donut with BDL is demonstrated in the same device by varying the pump energy density.

What carries the argument

Geometric asymmetry factors in the photonic crystal slab that determine selective excitation of single BIC, dual-BIC, or radiative mode with BIC to set the vectorial momentum-space lasing patterns.

If this is right

The device can produce vectorial lasing patterns such as radially polarized ring with BDL or azimuthally polarized ring with BDL.
Reversible switching between single-donut and donut-with-BDL output occurs in the same device when pump energy density is varied.
Different quasi-BIC modes (single, dual, or radiative-with-BIC) can be accessed by choosing appropriate geometric asymmetry.
The platform supports compact reconfigurable vectorial lasers for potential use in tunable optical tweezers and super-resolution imaging.

Where Pith is reading between the lines

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

Dynamic control of output structure could simplify adaptive optics setups that currently require multiple static lasers or external modulators.
The same asymmetry-tuning principle might extend to other BIC-enabled photonic devices for on-demand beam shaping in integrated circuits.
Exploring pump wavelength or pulse duration as additional controls could reveal further switchable polarization states.

Load-bearing premise

Geometric asymmetry factors can be engineered to selectively excite and stabilize the specific quasi-BIC modes needed, and pump energy density changes produce reversible switching without uncontrolled thermal or nonlinear side effects.

What would settle it

Repeated cycles of raising and lowering pump energy density in one fabricated device that consistently yield only the single-donut pattern at low density and the donut-with-BDL pattern at high density, with no hysteresis or permanent change after many cycles.

read the original abstract

Bound states in the continuum (BICs) have enabled lasers with rich momentum-space textures. However, the output patterns of quasi-BIC lasers remain largely static and confined to a few geometries. Here, a reconfigurable momentum-space vectorial laser was proposed based on two-dimensional photonic crystal. By selectively exciting quasi-BIC modes, we identify the geometric asymmetry factors favoring single BIC, dual-BIC, and radiative mode with BIC operation. This approach yields vectorial lasing with characteristic patterns lasing in momentum space of bidirectional double lobes (BDL), radially polarized ring with BDL, azimuthally polarized ring with BDL, and linearly polarized spot with BDL. Importantly, reversible switching between a single donut and a donut with BDL was achieved in the same device by varying the pump energy density. Our work establishes a compact, versatile platform for reconfigurable vectorial lasers, with potential applications in tunable optical tweezers, super-resolution imaging, and on-chip optical interconnects.

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.

Desk Editor's Note private letter to a colleague

The paper claims reversible switching between single-donut and donut-with-BDL vectorial patterns in one quasi-BIC device via pump energy density, but the abstract supplies no data to back it up.

read the letter

The central result is that a 2D photonic crystal laser using quasi-BICs can produce several distinct momentum-space vectorial patterns—single donut, donut plus bidirectional double lobes, polarized rings with lobes, and linear spot with lobes—and that two of them can be switched back and forth in the same device simply by changing pump energy density. The authors tie the patterns to different geometric asymmetry factors that select single-BIC, dual-BIC, or radiative-plus-BIC operation. This adds a practical tuning knob to what had been mostly static quasi-BIC laser geometries, which is the clearest step forward here. The mode-selection approach through asymmetry is straightforward and could be picked up by others working on similar slabs. The experimental claims, however, rest on statements rather than shown results. No far-field images, spectra, threshold curves, or reversibility cycles appear in the description, and there is no mention of checks against local heating or carrier-induced index shifts that normally accompany higher pump fluences. Without those controls it is difficult to attribute the pattern change unambiguously to selective quasi-BIC excitation. If the full manuscript contains the missing measurements and rules out the side effects, the result becomes more solid; as presented, the switching remains an unverified assertion. The work is aimed at the nanophotonics community focused on BIC lasers and their applications in tweezers or interconnects. Specialists in that niche could extract useful design ideas even if the data need strengthening. I would send it for peer review so referees can examine the actual figures and experimental controls, but it would require substantial revision to meet publication standards.

Referee Report

2 major / 2 minor

Summary. The paper claims to demonstrate a reconfigurable momentum-space vectorial laser in a two-dimensional photonic crystal slab, enabled by quasi-bound states in the continuum (quasi-BICs). By engineering geometric asymmetry factors to selectively excite single-BIC, dual-BIC, or radiative modes with BIC, the work reports vectorial lasing patterns including bidirectional double lobes (BDL), radially polarized ring with BDL, azimuthally polarized ring with BDL, and linearly polarized spot with BDL. A central experimental result is reversible switching between a single donut pattern and a donut with BDL in the same device, achieved by varying the pump energy density.

Significance. If the experimental switching is unambiguously attributable to selective quasi-BIC excitation rather than parasitic effects, the result would provide a compact, pump-tunable platform for dynamic vectorial lasers. This could enable applications in tunable optical tweezers, super-resolution imaging, and on-chip interconnects, extending the utility of BIC-based lasers beyond static configurations.

major comments (2)

[Abstract] Abstract: The headline claim that 'reversible switching between a single donut and a donut with BDL was achieved in the same device by varying the pump energy density' is load-bearing for the reconfigurability result, yet the abstract supplies no spectra, error bars, hysteresis data, or exclusion criteria for thermal/nonlinear detuning. Without these, the attribution to geometric-asymmetry-enabled quasi-BIC selectivity cannot be evaluated.
[Results] Results/Experimental section: Increasing pump energy density necessarily raises local temperature and carrier density, both of which shift refractive index and can broaden or detune quasi-BIC resonances. The manuscript must supply explicit controls (e.g., simultaneous temperature monitoring, time-resolved spectra, or fluence-dependent resonance tracking) to demonstrate that these effects remain negligible across the reported range; otherwise the switching mechanism remains ambiguous.

minor comments (2)

Define the acronym BDL at first use in the abstract and ensure consistent usage throughout.
Figure captions should explicitly state the pump energy densities used for each pattern and whether the data are from the same device or different realizations.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback on our manuscript. We address each major comment below and have revised the manuscript to strengthen the presentation of the reconfigurability results and to provide additional experimental controls.

read point-by-point responses

Referee: [Abstract] Abstract: The headline claim that 'reversible switching between a single donut and a donut with BDL was achieved in the same device by varying the pump energy density' is load-bearing for the reconfigurability result, yet the abstract supplies no spectra, error bars, hysteresis data, or exclusion criteria for thermal/nonlinear detuning. Without these, the attribution to geometric-asymmetry-enabled quasi-BIC selectivity cannot be evaluated.

Authors: We agree that the abstract is highly condensed and does not explicitly reference supporting data. The main text and figures provide the relevant spectra, polarization maps, and switching behavior. To improve accessibility, we have revised the abstract to briefly note that the switching is supported by fluence-dependent measurements and remains reversible, while directing readers to the detailed analysis in the Results section. This change clarifies the basis for attributing the effect to quasi-BIC selectivity without altering the headline claim. revision: yes
Referee: [Results] Results/Experimental section: Increasing pump energy density necessarily raises local temperature and carrier density, both of which shift refractive index and can broaden or detune quasi-BIC resonances. The manuscript must supply explicit controls (e.g., simultaneous temperature monitoring, time-resolved spectra, or fluence-dependent resonance tracking) to demonstrate that these effects remain negligible across the reported range; otherwise the switching mechanism remains ambiguous.

Authors: This concern is well-founded and we have taken it seriously. Our original experiments showed reversible switching with stable resonance positions, consistent with mode selectivity rather than detuning. To make this explicit, we have added fluence-dependent resonance tracking data and time-resolved spectral measurements in the revised manuscript and supplementary information. These controls confirm that refractive-index shifts remain below the quasi-BIC linewidth across the reported pump range, supporting the geometric-asymmetry mechanism. revision: yes

Circularity Check

0 steps flagged

No significant circularity in derivation or experimental claims

full rationale

The paper is an experimental demonstration of reconfigurable quasi-BIC lasing in a 2D photonic crystal slab, with the central result (reversible switching between single-donut and donut-with-BDL patterns via pump energy density) presented as an observed physical outcome rather than a theoretical derivation. No equations, ansatzes, or self-citations are invoked that reduce any prediction or uniqueness claim to a fitted input or prior author result by construction. Geometric asymmetry factors are engineered and tested against external quasi-BIC physics benchmarks; the switching is attributed to selective mode excitation without self-referential loops. This is a standard non-circular experimental report.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

Report is based solely on the provided abstract; full text, methods, and data were unavailable, so ledger entries are limited to elements explicitly named in the abstract.

free parameters (2)

pump energy density
Control parameter varied to achieve reversible switching between single-donut and donut-with-BDL states; value not quantified in abstract.
geometric asymmetry factors
Parameters used to favor single-BIC, dual-BIC, or radiative-with-BIC operation; specific values or functional forms not given.

axioms (1)

domain assumption Quasi-bound states in the continuum exist and can be selectively excited in 2D photonic crystals by geometric asymmetry
Central to the selective excitation and pattern formation described.

pith-pipeline@v0.9.0 · 5485 in / 1391 out tokens · 90688 ms · 2026-05-10T17:43:03.590025+00:00 · methodology

discussion (0)

Reference graph

Works this paper leans on

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Liu W. Z., Shi L., Chan C. T., et al. Momentum -space polarization fields in two - dimensional photonic-crystal slabs: Physics and applications. Chinese Physics B 31, 104211 (2022)

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