PMID- 25089976
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150521
LR  - 20181023
IS  - 1539-4522 (Electronic)
IS  - 1559-128X (Linking)
VI  - 53
IP  - 19
DP  - 2014 Jul 1
TI  - Unified field analysis method for IR/MW micro-mirror array beam combiner.
PG  - 4172-9
LID - 10.1364/AO.53.004172 [doi]
AB  - The aperture field integration method (AFIM) is proposed and utilized to 
      efficiently compute the field distributions of infrared/microwave (IR/MW) 
      micro-mirror array beam combiners, including the MW near-field distribution and 
      the IR far-field distribution. The MW near-field distributions of 
      single-dielectric-layer beam combiners with 1, 11, and 101 micromirrors are 
      analyzed by AFIM. Compared to the commonly used multilevel fast multipole method 
      (MLFMM) in the computation of MW near-field distribution, the memory requirement 
      and CPU time consumption are reduced drastically from 16.92 GB and 3.26 h to 0.66 
      MB and 0.55 s, respectively. The calculation accuracy is better than 96%, when 
      the MW near-field distribution is computed. The IR far-field computational 
      capability is validated by comparing the results obtained through AFIM and 
      experiment. The MW near field and IR far field of a circular and a square shape 
      of three-layer micro-mirror array beam combiners are also analyzed. Four 
      indicators E pv , E rms , phi pv , and phi rms representing the amplitude and phase 
      variations are proposed to evaluate the MW near-field uniformity. The simulation 
      results show that the increase of beam combiner size can improve the uniformity 
      of the MW near field, and that the square shape has less influence on the 
      uniformity of the MW near field than the circular one. The zeroth-order 
      diffraction primary maximum intensity of the IR far field is decreased by 1/cos 2 
       alpha 0 times compared to that of the equivalent mirror, where alpha 0 is the oblique 
      angle of each micromirror. When the periodic length of the micro-mirror array is 
      less than 0.1 mm, the position of the secondary maximum will exceed the size of 
      the focal plane array. Simultaneously, the half-width of the zeroth-order 
      diffraction primary maximum is less than the size of a single pixel. Thus, IR 
      images with high quality will be obtained. The simulation results show that the 
      AFIM as a unified method can be applied to design, analyze, evaluate, and 
      optimize IR/MW micro-mirror array beam combiners.
FAU - Tian, Yi
AU  - Tian Y
FAU - Sun, Gang
AU  - Sun G
FAU - Yan, Hui
AU  - Yan H
FAU - Zhang, Li
AU  - Zhang L
FAU - Li, Zhuo
AU  - Li Z
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Appl Opt
JT  - Applied optics
JID - 0247660
EDAT- 2014/08/05 06:00
MHDA- 2014/08/05 06:01
CRDT- 2014/08/05 06:00
PHST- 2014/08/05 06:00 [entrez]
PHST- 2014/08/05 06:00 [pubmed]
PHST- 2014/08/05 06:01 [medline]
AID - 294226 [pii]
AID - 10.1364/AO.53.004172 [doi]
PST - ppublish
SO  - Appl Opt. 2014 Jul 1;53(19):4172-9. doi: 10.1364/AO.53.004172.