A feasible method for real-time measuring the refractive index of micron-scale biological silks at different humidity

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-04-22 DOI:10.1007/s00340-025-08425-y

Yu Zhang, Yutong Zhao, Siying Cheng, Min Zhang, Yifan Qin, Yaxun Zhang, Zhihai Liu

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引用次数: 0

Abstract

Biological silk is a natural optical waveguide with humidity-sensitive properties. The refractive index (RI) is a critical parameter that determines the optical properties of waveguides and is greatly affected by humidity. In this article, we propose an optical method for real-time measuring the RI of micron-scale biological silks at different humidity. We employ a section of single-mode fiber (SMF) and a section of biological silk to configure an F-P cavity structure. By recording the spectrum and diameter of the silk under different humidity, we can obtain the relationship among free spectral range (FSR)、diameter, and relative humidity (RH). Based on this relationship, we calculate the variation of RI with humidity. We measure three materials in the 30–80% RH range. The measurement results indicate that during this process, the RI of spider egg sac silk (SESS) ranges from 1.491 ± 0.003 to 1.412 ± 0.009, mulberry silk is 1.551 ± 0.009 to 1.473 ± 0.005, and radial silk is 1.549 ± 0.005 to 1.479 ± 0.003. The relative uncertainty in the range ± 5 × 10^− 3 to ± 7 × 10^− 3 is achieved for these challenging samples. This rapid and convenient measurement method provides a new perspective for applying biological silks.

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一种实时测量不同湿度下微米尺度生物丝折射率的可行方法

生物丝是一种具有湿度敏感特性的天然光波导。折射率（RI）是决定波导光学特性的关键参数，受湿度影响较大。在本文中，我们提出了一种实时测量微米尺度生物丝在不同湿度下的RI的光学方法。我们使用一段单模光纤（SMF）和一段生物丝来配置F-P腔结构。通过记录不同湿度条件下蚕丝的光谱和直径，可以得到自由光谱范围（FSR）、直径和相对湿度（RH）之间的关系。基于这种关系，我们计算了RI随湿度的变化。我们在30-80% RH范围内测量三种材料。测量结果表明，在此过程中，蜘蛛卵囊丝（SESS）的RI范围为1.491±0.003 ~ 1.412±0.009，桑蚕丝为1.551±0.009 ~ 1.473±0.005，径向丝为1.549±0.005 ~ 1.479±0.003。对于这些具有挑战性的样品，相对不确定度范围为±5 × 10−3至±7 × 10−3。这种快速方便的测定方法为生物丝的应用提供了新的前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.