| 摘要 |
A two-dimensional photonic crystal resonator realizing a high Q-value. Voids (22) are arranged periodically in a slab-like body (21). The body (21) is divided into three regions (31- 33) and the period of arranging the voids (22) is set at a1 in the region (31) and set at a2 smaller than a1 in the regions (32, 33). Furthermore, a waveguide (23) passing through three regions is provided by eliminating the voids (22) linearly. Consequently, lights in a wavelength band dependent on the period of the voids (22) can propagate on the waveguide (23). Wavelength band of light propagating on the waveguide is different between the region (31) and the regions (32, 33) because the period of the voids is different. Consequently, a light having a wavelength included in the waveguide transmission wavelength band of the region (31) but not included in the waveguide transmission wavelength band of the regions (32, 33) is confined in the waveguide of the region (31) and resonates. The waveguide of the region (31) thereby functions as a resonator.
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