Development of wavelength tunable optical filter with independently variable bandwidth using a ferroelectric liquid crystals

2014 Fiscal Year Final Research Report

• Project/Area Number: 25790042
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: Ehime University
• Principal Investigator: OZAKI Ryotaro 愛媛大学, 理工学研究科, 准教授 (90535361)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 液晶 / 強誘電性液晶 / フォトニック結晶 / 光学フィルタ / バンド幅可変

Outline of Final Research Achievements

The chiral smectic C phase of ferroelectric liquid crystals has a self-assembling helical structure which is regarded as a one-dimensional pseudo-photonic crystal. It is well known that a stop band of a ferroelectric liquid crystal can be tuned in wavelength domain by changing temperature or electric field. We have investigated the wavelength tunable optical filter with independently variable bandwidth using a full pitch band of ferroelectric liquid crystals. Electric field dependence of the ferroelectric liquid crystal director profiles is calculated by continuum theory, and then the optical properties of the full pitch band are calculated by the 4x4 matrix method. The results indicate that the bandwidth and wavelength can be independently controlled by varying incident angle, and electric field. We also experimentally investigated the transmission properties of the full pitch band.

Free Research Field

工学