[16p-Z05-1~9] 量子マテリアルとTHz-赤外光電場が拓くフォトニクス応用

▲ [16p-Z05-4] Phase-Change Mid-Infrared Microcavity Photonics

〇Toshiharu Saiki¹、Masashi Kuwahara² (1.Keio Univ.、2.AIST)

キーワード：microcavity, phonon polariton, phase-change materials

In this presentation, we discuss two possible applications of modification of mid-infrared light confinement in microcavities using a phase-change material. In the first topic, we propose a method to encode a subwavelength image into the mid-infrared optical spectrum. A silicon microcavity is used to generate light confinement modes with a variety of field distributions and a wide range of resonant peaks. The spectrum can be modified due to the change in refractive index of the phase-change film. The second topic includes control of surface phonon polariton (SPhP) confinement with phase change material for tunable surface enhanced mid-infrared spectroscopy. We employ “phase-change reflection mirrors” to confine the SPhP. Narrow absorption band and the tunability of SPhP supported by SiC are experimentally demonstrated.