We provide an improved surface-mode photonic crystal (PhC) -junction waveguide, combine it with an improved PhC bandgap -junction waveguide, and then provide an ultracompact TM-polarized beam splitter. The energy is split equally into the four output waveguides. The maximal transmission ratio of each output waveguide branch equals 24.7%, and the corresponding total transmission ratio of the ultracompact beam splitter equals 98.8%. The normalized frequency of maximal transmission ratio is 0.397(), and the bandwidth of the ultracompact TM-polarized beam splitter is 0.0106(). To the best of our knowledge, this is the first time such a high-efficiency beam splitter exploiting the nonradiative surface mode as a guided mode has been proposed. Although we only employed a beam splitter, our design can easily be extended to other beam splitters.
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