This paper presents the properties of optical planar waveguides made of silk fibroin, extracted from Bombyx mori cocoons deposited on an allyl diglycol carbonate substrate. Raman spectroscopy and Fourier-transform infrared spectroscopy were used to characterise the molecular structures of the silk fibroin layer, while the waveguiding properties were measured by the m-line spectroscopy at six wavelengths 532.0, 654.2, 846.4, 1308.2, 1549.1 and 1652.1 nm. The measurement proved that the silk fibroin layers guide light at all measured wavelengths. Optical losses were measured by scanning a fibre-optic probe at 846.4 and 1549.1 nm; they were estimated to be 0.24 dB cm⁻¹ and 0.25 dB cm⁻¹, respectively. Our results have proved that the Bombyx mori silk fibroin has a great potential for realization of optical waveguides for new bio-photonic devices.

本文呈现制成丝纤蛋白的光学平面波导，从提取的属性家蚕的茧沉积烯丙基二甘醇碳酸酯基材上。拉曼光谱和傅立叶变换红外光谱用于表征丝素蛋白层的分子结构，而导波性能通过m线光谱法在六个波长532.0、654.2、846.4、1308.2、1549.1和1652.1 nm处测量。该测量证明，丝素蛋白层在所有测得的波长下引导光。通过在846.4和1549.1 nm处扫描光纤探头来测量光损耗；估计分别为0.24 dB cm ^-1和0.25 dB cm ^-1。我们的结果证明了家蚕 丝素蛋白在实现用于新型生物光子设备的光波导方面具有巨大的潜力。