Surface roughness effect on optical loss in waveguide using isotropically induced crosslink network of siloxane–polyimide copolymer,Journal of Applied Polymer Science

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Surface roughness effect on optical loss in waveguide using isotropically induced crosslink network of siloxane–polyimide copolymer
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-06-29 , DOI: 10.1002/app.49554
Noor Farahin Mohd Ibrahim ₁ , Mohamad Riduwan Ramli ₁ , Arjulizan Rusli ₁ , Mohd Kamil Abd Rahman ₂ , Zulkifli Ahmad ₁

Affiliation

Optical properties of two‐fluorinated polysiloxane‐co‐polyimide (PI‐PDMS and 3‐(aminopropyl)triethoxysilane [PI‐APTES]) were investigated based on their molecular structure and compared with the pure PI at 1,550 nm radiation. The refractive indexes and birefringence of the copolymers were reduced which is attributable to the chain flexibility as substantiated from the differential scanning calorimetry result. They are highly transparent at near infrared (NIR) region with light transmittance above 90% at visible region while displaying excellent thermal stability up to 456°C. Asymmetry planar waveguides was fabricated which recorded a respectable low optical loss 0.020 dB/cm for pure PI, 0.042 dB/cm for PI‐PDMS, and 0.066 dB/cm for PI‐APTES, respectively. Despite proving low NIR absorption and low birefringence, extrinsic factor namely surface roughness was accounted as affecting the higher optical loss in polyimide siloxane copolymer compared to pure PI. The excellent thermal and optical properties displayed by these series of material established their viable application as waveguide material at 1,550 nm wavelength.

中文翻译：

使用硅氧烷-聚酰亚胺共聚物的各向同性交联网络，表面粗糙度对波导中的光损耗产生影响

二氟聚硅氧烷共聚物的光学性质根据聚酰亚胺（PI-PDMS和3-（氨基丙基）三乙氧基硅烷[PI-APTES]）的分子结构进行了研究，并将其与1,550 nm辐射下的纯PI进行了比较。共聚物的折射率和双折射降低，这归因于差示扫描量热法结果证实的链柔性。它们在近红外（NIR）区域高度透明，可见区域的透光率超过90％，同时在高达456°C的温度下仍具有出色的热稳定性。制作了不对称平面波导，分别记录了纯PI的0.020 dB / cm，PI-PDMS的0.042 dB / cm和PI-APTES的0.066 dB / cm的低光损耗。尽管NIR吸收率低且双折射低，外在因素，即表面粗糙度被认为是与纯PI相比影响聚酰亚胺硅氧烷共聚物中较高的光学损耗的原因。这些系列材料表现出的出色的热和光学性能确立了其在1,550 nm波长下作为波导材料的可行应用。

更新日期：2020-06-29

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