Fig. 5
From: Unique wing scale photonics of male Rajah Brooke’s birdwing butterflies
Structure of the green-colored wing scales. a Epi-illumination light micrograph of a green area (#10 of Fig. 1a). b Scanning elecron micrograph of a single green scale. c Close-up on-view SEM image showing ridges and minute gaps between them. d TEM cross-sectional image of a green cover scale and a black ground scale. e Cross-sectional SEM image of a green scale showing the extreme order of multiple ridges. d An isolated green wing scale immersed in refractive index matching fluid observed in transmitted light. Scale bars: a 100 μm. b 50 μm, c-f: 2 μm