>How Does It Work? Silicon goes from opaque to transparent in the range of 1000 nm to 1100 nm (shaded band in the illustration below). Above 1100 nm, it’s as tr

>How Does It Work? Silicon goes from opaque to transparent in the range of 1000 nm to 1100 nm (shaded band in the illustration below). Above 1100 nm, it’s as transparent as a pane of glass; below 1000 nm, it rapidly becomes more opaque than the darkest sunglasses. So expect to see more epoxy blobs on top of chips.