Plasma post-processing of diamond-like carbon nano-coated long-period gratings

被引:0
|
作者
Smietana, Mateusz [1 ]
Krysinski, Adrian [1 ]
Bock, Wojtek J. [2 ]
Mikulic, Predrag [2 ]
机构
[1] Warsaw Univ Technol, Inst Microelect & Optoelect, Koszykowa 75, PL-00662 Warsaw, Poland
[2] Univ Quebec, Ctr Rech Photon, Hull, PQ J8X 3X7, Canada
关键词
optical fiber sensors; long-period gratings; refractive index sensing; thin films; diamond-like carbon; optical properties; reactive ion etching; OPTICAL-PROPERTIES; FIBER GRATINGS; FILMS; SENSITIVITY; DEPOSITION; THICKNESS; SURFACE;
D O I
10.1117/12.2031698
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
This work presents an application of reactive ion etching (RIE) for effective tuning of spectral response and the refractive-index (RI) sensitivity of diamond-like carbon (DLC) nano-coated long-period gratings (LPGs). The technique allows for an efficient and well controlled etching of the DLC by means of O-2 and CF4 plasma. The effect of DLC nano-coating etching on spectral properties of the LPGs is discussed. We correlated the decrease in DLC thickness with the shift of the LPG resonance wavelength. The thinning of the overlay effectively changes the distribution of the cladding modes and thus it also has an impact on the device's RI sensitivity. The advantage of this approach is a capability for post-processing of the nano-coated structures with a good precision (etching rate from 4.6 to 8.1 nm/min for O-2 plasma), cleaning the samples and their re-coating according to requested needs.
引用
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页数:4
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