- 期刊
- OpenAccess
Investigations of Phononic Bandgap in a 3D Quantum-Dot Crystal
並列摘要
We theoretically study the phononic band-gap effect of an artificial nanocrystal composed of three-dimensionally (3D) ordered quantum dots. The calculated phonon dispersion indicates the existence of high-order longitudinal acoustic modes propagating along the growth direction due to the low aspect ratio of the unit cell. The observed phononic band gaps in the sub-THz frequency range result in high acoustic reflectivity of the nanocrystal at the band-gap frequencies. In addition to the phononic band gaps, the acoustic transmission spectrum reveals remarkable scattering loss at several specific frequencies, which could suggest the coupling between the longitudinal acoustic phonons and confined modes of isolated quantum dots. Our investigation provides a theoretical insight into the lattice dynamics of the quantum-dot crystal, complementary to the recent femtosecond ultrasonic experiment.
並列關鍵字
無資料延伸閱讀
- 邱銘輝（2004）。Band Gap Analysis and Light Propagation Properties of Two Dimensional Photonic Crystals〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2004.01571
- Cheng, T. C. (2006). Measurement and applications of total band gap with Si-based phononic crystals [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2006.02503
- 王允中（2006）。Two and Three-Dimensional Photonic Crystal Band Gap Analysis and Applications〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2006.00820
- Liao, Y. K. (2005). Synthesis of Two-Dimensional Photonic Crystals for Large Band Gaps [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2005.00383
- 余昇鴻（2006）。Band Gap Analysis and Light Propagation Properties of Three Dimensional Photonic Crystals〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2006.01366