Ultralow mode-volume photonic crystal nanobeam cavities for high-efficiency coupling to individual carbon nanotube emitters

被引：106
作者：
Miura, R. [1 ]
Imamura, S. [1 ]
Ohta, R. [2 ]
Ishii, A. [1 ]
Liu, X. [1 ]
Shimada, T. [1 ]
Iwamoto, S. [2 ]
Arakawa, Y. [2 ]
Kato, Y. K. [1 ]
机构：
[1] Univ Tokyo, Inst Engn Innovat, Tokyo 1138656, Japan
[2] Univ Tokyo, Inst Ind Sci, Tokyo 1538505, Japan
来源：
NATURE COMMUNICATIONS | 2014年 / 5卷
关键词：
SPONTANEOUS EMISSION; QUANTUM-DOT; MICROCAVITY; EXCITONS; NANOCAVITY; DRIVEN; LASERS; SCALE;
D O I：
10.1038/ncomms6580
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The unique emission properties of single-walled carbon nanotubes are attractive for achieving increased functionality in integrated photonics. In addition to being room-temperature telecom-band emitters that can be directly grown on silicon, they are ideal for coupling to nanoscale photonic structures. Here we report on high-efficiency coupling of individual air-suspended carbon nanotubes to silicon photonic crystal nanobeam cavities. Photoluminescence images of dielectric-and air-mode cavities reflect their distinctly different mode profiles and show that fields in the air are important for coupling. We find that the air-mode cavities couple more efficiently, and estimated spontaneous emission coupling factors reach a value as high as 0.85. Our results demonstrate advantages of ultralow mode-volumes in air-mode cavities for coupling to low-dimensional nanoscale emitters.
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页数：5
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