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Developing materials and structures that have unusual absorption characteristics in the optical wavelength range is important for applications such as photovoltaics, 1, 2 control of thermal radiation, 3, 4 and photodetectors. 5, 6 Photonic crystals consisting of metallic materials exhibit a number of interesting properties at optical frequencies, if properly designed. In particular, one-dimensional photonic crystals composed of a stack of alternating layers of metallic and dielectric materials can be designed to be transparent over a tunable range of optical frequencies. 7, 8 These structures can also be designed to enhance reflection 9 or absorption. 10 In addition, three-dimensional metallic photonic crystals can exhibit absorption suppression in the photonic band gap and strong absorption enhancement at the photonic band edge. 3, 4 The enhancement is attributed to the slower group velocity of light at the band edge …