Phonon Focusing Patterns In Cubic Crystals

 

∆ (a,b) FT mode [100] ST mode [100] FT mode [111] ST mode [111] Results
    φ1   φx, φ2β φ2α  
∆>0  4.2,-0.6

 

φ1=19.75
φx=73.58
φ2α=26.33
φ2β=66.72
 
  3.8,-0.4

φ1=24.58
φx=71.39
φ2α=31.65
φ2β=61.82
 
  3.4,-0.2

φ1=30.74
φx=68.55
φ2α=37.77
φ2β=56.10
 
  3.0,0.0

φ1=38.69
φx=64.76
φ2α=44.40
φ2β=49.54
 
  2.9,0.05

φ1=40.91
φx=63.61
φ2α=45.85
φ2β=48.00
 
  2.8,0.1

φ1=43.08
φx=62.36
φ2α=46.81
φ2β=46.85
 
  2.7,0.15

φ1=44.81
φx=60.99
φ2α=       
φ2β=       
 
             
      φ1,φ2α φx, φ2β    
∆<0 2.0,0.5

φ1=1.213
φx=46.69
φ2α=       
φ2β=       
 
  1.9,0.55

φ1=5.117
φx=43.67
φ2α=2.386
φ2β=89.82
 
  1.8,0.6

φ1=9.815
φx=40.32
φ2α=6.237
φ2β=87.94
 
  1.7,0.65

φ1=14.80
φx=36.59
φ2α=10.71
φ2β=85.34
 
  1.6,0.7

φ1=19.84
φx=32.47
φ2α=15.51
φ2β=82.42
 
  1.4,0.8

φ1=29.49
φx=22.99
φ2α=25.45
φ2β=76.15
 
  1.2,0.9

φ1=38.07
φx=11.98
φ2α=35.14
φ2β=69.72
 
             
  Note:

{001} plane:
φ1 (inflection caustic point)

{011} planes:
φx            (anticaustic point)
φ2α, φ2β, (inflection caustic point)

(Yardstick: 10o)

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