Supporting Information for
Dual-wavelength polymer laser based on an
active/inactive/active sandwich-like structure
Tianrui Zhai*, Xiaofeng Wu, Meng Wang, Fei Tong, Songtao Li, Yanbin Ma,
Jinxiang Deng, and Xinping Zhang*
Institute of Information Photonics Technology and College of Applied Sciences, Beijing
University of Technology, Beijing 100124, China
*Corresponding authors: [email protected] and [email protected]
Table of Contents
1. Polarization dependence of the polymer laser ..................................................................... 2
2. Slab waveguide theory for the polymer laser ....................................................................... 2
References ................................................................................................................................. 3
1. Polarization dependence of the polymer laser
For the polymer laser based on the multilayer structure, the typical polarization
response is shown in Fig. S1.
Fig. S1. (a) Enlarged view of the laser spot. The double-headed red arrow indicates the
polarization direction of the polarizer. α is the angle between the polarization direction of the
polarizer and the lasing line denoted by the red dotted line. (b) The output intensity of the polymer
laser with different angle α. The 554 nm and 569 nm laser modes are denoted by the blue and red
curves, respectively.
The laser output is a linear polarization light, which is parallel to the grating lines.
Figure S1(a) and (b) demonstrate the characterization of the polarization of the output
of the DFB polymer laser. The output beam is directed though a rotatable polarizer,
which is analyzed by the Maya 2000 Pro spectrometer. A strongly polarized emission
parallel to the grating lines is observed as shown in Fig. S1(b).
2. Slab waveguide theory for the polymer laser
For simplicity, the refractive index of the hybrid layer is defined as αn2+(1-α)n4. α
is the volume ratio between F8BT and PR in the hybrid layer. In the simulation, n1=1.45,
n2=1.68, n3=1.5, n4=1.82, n5=1, α=0.8.1 The field distribution of the TE0 mode in the
active/inactive/active sandwich-like structure is defined as below:
a1eb1x

a2 sin  b2 x   a3 cos  b2 x 

E y ( x)  a4eb3 x  a5e b3 x
a sin b x  a cos b x
4  7 4 
 6
a e b5 x
 8
x0
0 xh
h  x  ht
S1
ht  x  ht d
x  ht d
where ai (i=1, 2, 3, ..., 8) represents the relative field amplitude coefficient. bj (j=1,
2, 3, 4, 5) denotes the transverse wave number.
2
b2  2  n22  neff
,
2
b3  2  neff
 n32
,
2
b1  2  neff
 n12 ,
2
b4  2  n42  neff
,
2
b5  2  neff
 n52 . By applying the boundary conditions, the distributions of the
electric field in each guiding layer are obtained numerically by using MATLAB
software.
References
1
M. Campoy-Quiles, G. Heliotis, R. Xia, M. Ariu, M. Pintani, P. Etchegoin, and D. Bradley, Adv.
Funct. Mater. 15, 925–933 (2005).