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Surface Plasmon Resonance Sensors Using Fractional Optical Vortices
by George Andrei Bulzan
Submission summary
| Authors (as registered SciPost users): | Bulzan George Andrei |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202510_00023v1 (pdf) |
| Date submitted: | Oct. 15, 2025, 5:31 p.m. |
| Submitted by: | Bulzan George Andrei |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
This study focuses on the response on reflectance of a surface plasmon resonance (SPR) sensor when hit by a Laguerre-Gaussian (LG) beam with a fractional orbital angular momentum (OAM) quantum number. More exactly, it investigates the change of the position and value of its minimum point with respect to the situation in which plane waves without OAM were used. Thus, an analytical expression for this physical quantity has been obtained based on which numerical results have been plotted. Those results are similar to the case in which the OAM quantum number was an integer. However, the use fractional optical vortices (FOV) has numerous practical advantages regarding the manipulation of the molecules of the analyte.
Author indications on fulfilling journal expectations
- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block
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Requested changes
1-If possible, add a few sentences where a motivation is put forward, explaining why beams with FOVs could behave differently from plane wave in the Kretschmann configuration.
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Author: Bulzan George Andrei on 2025-12-04 [id 6104]
(in reply to Report 1 on 2025-11-29)Thank you for your report and all my appologies for the waiting!
As the equation (17) shows the reflectance is dependent on the orbital angular momentum (OAM) in the sense that 2 of the 3 terms in the paranthesis are directly proportional with l+1 where l is the OAM quatum number or the topological charge. Therefore, the lower the l value is, the lesser the FOV's impact on it is. I chose 1.5 and 6.5 as values for l in the numerical results presented but for bigger values of l bigger differences between FOV's and plane waves are expected.
As for the motivation behind this work, one can consider the FOV's capabilities to manipulate particles, to create optical traps and to sort and orientationally control cells, the last of which can lead to new applications of RPS in different domains of medicine and biology. Although, I will wait for the recomendations of the Editor-in-Charge before doing any change on the paper.