Liquid crystal lasers: recent advances

During the past decade, photonic band edge lasers based on cholesteric liquid crystals (CLCs) have attracted considerable interest as self-assembled coherent, tunable lights sources. We report on recent progress towards practical applications: (i) Electrical fine tuning of laser emission by in-plane electric fields: the field-induced distortion of the cholesteric helix allows for a controllable, continuous and reversible shift of the band edge resonances. (ii) Improvement of lasing performance by application of an electric field along the helical axis of a system with negative dielectric anisotropy: the electric field stabilizes the soft photonic structure against heating-induced distortions. (iii) PDMSenclosed LC lasers for lab-on-a-chip applications: We demonstrate the formation of a uniform planar cholesteric texture between polydimethylsiloxane (PDMS) substrates and narrow-band laser emission of a PDMS-enclosed LC laser. With PDMS being the standard material for the fabrication of microfluidic devices, this opens a simple and flexible route for the integration of coherent light sources in lab-on-a-chip designs.

[1]  M. Ozaki,et al.  Tunable Lasing from a Cholesteric Liquid Crystal Film Embedded with a Liquid Crystal Nanopore Network , 2011, Advanced materials.

[2]  Heino Finkelmann,et al.  Probing the Photonic Properties of a Cholesteric Elastomer under Biaxial Stress , 2005 .

[3]  E. Hanelt,et al.  Color changing and lasing stretchable cholesteric films. , 2008, Optics express.

[4]  Hiroyuki Yoshida,et al.  Position sensitive, continuous wavelength tunable laser based on photopolymerizable cholesteric liquid crystals with an in-plane helix alignment , 2009 .

[5]  John A Rogers,et al.  Molecular-scale soft imprint lithography for alignment layers in liquid crystal devices. , 2007, Nano letters.

[6]  Stephen M. Morris,et al.  Liquid-crystal lasers , 2010 .

[7]  Sung Tae Kim,et al.  Laser Emission in a Dye Doped Cholesteric Polymer Network , 2002 .

[8]  Shaw H. Chen,et al.  Spatially resolved lasers using a glassy cholesteric liquid crystal film with lateral pitch gradient , 2011 .

[9]  E. A. Tikhonov,et al.  Generation of a tunable radiation by impurity cholesteric liquid crystals , 1980 .

[10]  Shin-Tson Wu,et al.  Spatially tunable laser emission in dye-doped photonic liquid crystals , 2006 .

[11]  Andy Ying-Guey Fuh,et al.  Cholesteric liquid crystal laser with wide tuning capability , 2005 .

[12]  E. Terentjev,et al.  Single-mode laser tuning from cholesteric elastomers using a "notch" band-gap configuration. , 2010, Optics express.

[13]  M. Ozaki,et al.  Electric Field Dependence of Lasing Wavelength in Cholesteric Liquid Crystal with an In-Plane Helix Alignment , 2010 .

[14]  V. Kopp,et al.  Low-threshold lasing at the edge of a photonic stop band in cholesteric liquid crystals. , 1998, Optics letters.

[15]  Y. Takanishi,et al.  Position-Sensitive Cholesteric Liquid Crystal Dye Laser Covering a Full Visible Range , 2007 .

[16]  Masanori Ozaki,et al.  Discontinuous Shift of Lasing Wavelength with Temperature in Cholesteric Liquid Crystal , 2003 .

[17]  Heinz-S. Kitzerow,et al.  Electrical fine tuning of liquid crystal lasers , 2012 .

[18]  Peter Palffy-Muhoray,et al.  Tunable Mirrorless Lasing in Cholesteric Liquid Crystalline Elastomers , 2001 .

[19]  M. Ozaki,et al.  Electro‐Tunable Liquid‐Crystal Laser , 2003 .

[20]  C. Papenfuss,et al.  Blue phase mixtures exhibiting low fractions of a chiral compound experimental observation of some unusual properties , 1990 .

[21]  E. Terentjev,et al.  Polydimethylsiloxane-enclosed liquid crystal lasers for lab-on-chip applications , 2010 .