Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.
G. NABIL1, H. P. CHAN1,* , M. A. UDDIN1
Liquid crystal (LC) response time plays a crucial role on the switching of the LC-based devices in photonic applications. It is significantly influenced by the surface structure of the substrate. Therefore, an alignment layer is typically deposited to give a preferred direction to the LC molecules in contact to the surface. In this paper, the rise time of LC on a patterned benzocyclobutene (BCB) was studied and compared with that on a conventional rubbed polyimide (PI) alignment layer. A faster rise time was achieved for the LC cell with patterned BCB alignment layer than that of PI alignment layer. The shortest rise time (τr) reached in our study is 0.06 ms for LC aligned on the patterned BCB layer and 0.18 ms for rubbed PI layer under a field strength of 3.3V/μm for a LC film thickness of 3μm. Therefore the patterned BCB as alignment layer is very potential in the LC based polymer waveguide devices. When the BCB can act both as waveguide materials and alignment materials, the technique also can reduce a fabrication step of LC based polymer waveguide devices. Thus the study can enhance the application of LC based optical waveguide devices for photonics technology.
Nematic liquid crystals, Photonic applications, Response time, Alignment layer, Optical waveguides, Benzocyclobutene (BCB), Patterned by photolithography.
G. NABIL, H. P. CHAN, M. A. UDDIN, Improvement in rise time of liquid crystals with patterned benzocyclobutene as alignment layer for photonic applications, Optoelectronics and Advanced Materials - Rapid Communications, 3, 10, October 2009, pp.1083-1089 (2009).
Submitted at: Sept. 16, 2009
Accepted at: Oct. 2, 2009
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
Active accounts were imported to the new platform and assigned a random password by default. In order to access your account you need to access the login page and go through the Lost Password dialog (involves the system sending you an email with instructions) in order to reset your password. This step is necessary as passwords are kept in hashed form and the new platform uses modern hashing algorithms incompatible with the previous ones.