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Choi, Hyunhee,Nishimura, Suzushi,Toyooka, Takehiro,Ishikawa, Ken,Takezoe, Hideo WILEY‐VCH Verlag 2011 Advanced Functional Materials Vol.21 No.18
<P><B>Abstract</B></P><P>Detailed optical lasing characteristics in liquid crystal (LC) microlasers consisting of multiple polymer cholesteric LC (PCLC) layers are presented as broadband resonators sandwiching a layer of thick gain media, dye‐containing nematic LC (NLC) or isotropic liquid, in between. Multiple lasing emission peaks due to Fabry‐Perot cavity modes are observed for both gain media, and their polarization characteristics investigated. To analyze lasing characteristics, specified eigen modes are defined, the polarization states of which are maintained before and after passing through the broadband resonator, and obtained for the present full system by using the Berreman 4 × 4 matrix method. Using these specified eigen modes, the optical density for each mode is calculated and compared with the experimental results, and shows good agreement. Finally, lasing characteristics between the resonators with NLC and isotropic gain media are compared, and the advantages of adopting dye‐doped NLC gain medium are shown for tunable red, green, blue lasing in a microlaser system with a broadband resonator.</P>
Choi, Hyunhee,Kim, Junghee,Nishimura, Suzushi,Toyooka, Takehiro,Araoka, Fumito,Ishikawa, Ken,Wu, Jeong Weon,Takezoe, Hideo WILEY-VCH Verlag 2010 Advanced Materials Vol.22 No.24
<B>Graphic Abstract</B> <P>Multiple polymer cholesteric liquid crystal (PCLC) layers with different pitches and a sandwich structure of nematic liquid crystal by these PCLC films are presented. The former serves as broadband-distributed Bragg reflectors and the latter as multiple-band electrotunable filters. Using the latter dye-doped hybrid film red–green–blue simultaneous lasing due to Fabry–Perot cavity modes is achieved (see figure). <img src='wiley_img_2010/09359648-2010-22-24-ADMA200904110-content.gif' alt='wiley_img_2010/09359648-2010-22-24-ADMA200904110-content'> </P>
Color- and Reflectance-Tunable Multiple Reflectors Assembled from Three Polymer Films
Ha, Na Young,Jeong, Soon Moon,Nishimura, Suzushi,Takezoe, Hideo WILEY-VCH Verlag 2010 Advanced Materials Vol.22 No.14
<B>Graphic Abstract</B> <P>Tunings of reflectance and colors of multiple photonic bandgaps are demonstrated in the whole visible region by changing the polarization state of incident light. Two tunable systems are assembled from the same three materials of an anisotropic polymeric nematic liquid crystal film and two kinds of isotropic polymer film. The only difference between the two systems is the stacking sequence. <img src='wiley_img_2010/09359648-2010-22-14-ADMA200903415-content.gif' alt='wiley_img_2010/09359648-2010-22-14-ADMA200903415-content'> </P>
Color-temperature tunable white reflector using bichiral liquid crystal films
Ha, Na Young,Jeong, Soon Moon,Nishimura, Suzushi,Takezoe, Hideo The Optical Society 2010 Optics express Vol.18 No.25
<P>We have demonstrated multicolored reflections showing various whitish colors from a bichiral liquid crystal (LC) film. The bichiral LC film was fabricated by using left-handed and right-handed polymeric cholesteric liquid crystal (CLC) films with two different helical pitches and an isotropic polymer film in between. Color temperatures of the multiple reflections are controlled from ~4000 K to ~10000 K by changing linear polarization directions of normally incident and reflected lights. This characteristic can extend practical applications of CLCs to illuminant devices.</P>