530512.fig.002a
(a)
530512.fig.002b
(b)
530512.fig.002c
(c)
530512.fig.002d
(d)
530512.fig.002e
(e)
530512.fig.002f
(f)
530512.fig.002g
(g)
530512.fig.002h
(h)
530512.fig.002i
(i)
Figure 2: Examples of filters presented in literature: (a) reject band peak at 6.9 and 20.3 THz; (b) reject band peak at 3.8 and 7.0 THz; (c) reject band peak at 2.7 and 5.9 THz [20]; (d) band pass filter at 1.7 THz; (e) high-pass filter at 1.1 THz [21]; (f) blocking of multiple frequency bands [22]; (g) band pass at 7 microns [23]; (h) band stop sample [24]; (i) band pass sample [12].