Design of a high-Q fiber cavity for omnidirectionally emitting laser with one-dimensional topological photonic crystal heterostructure

Photonic-plasmonic hybrid microcavities: Physics and applications*

“…[102] However, the mode volume V of the photonic dielectric microcavities is always near a cubic of wavelength and hard to decrease due to the laws of diffraction, which limits the enhancement of the figure of merit Q/V . [34,43] 3. Photonic-plasmonic hybrid microcavities…”

“…In the last decade, great progress has been made in realizing high quality factor Q dielectric microcavities for improving the value of Q/V , such as whispering-gallery-mode (WGM) microcavities [31][32][33][34][35][36][37][38][39][40] and photonic crystal (PhC) cavities. [26,[41][42][43][44][45][46][47] However, the mode volume V in these systems is always larger than (λ /2) 3 due to the laws of diffraction, which limits the improvement of the figure of merit Q/V . [33][34][35][36][42][43][44][45] On the other hand, plasmonic nano-cavities or plasmonic nano-antennas have the properties of localized surface plasmon resonances, so they can confine light into ultra-small volumes far below the diffraction limit.…”

“…[26,[41][42][43][44][45][46][47] However, the mode volume V in these systems is always larger than (λ /2) 3 due to the laws of diffraction, which limits the improvement of the figure of merit Q/V . [33][34][35][36][42][43][44][45] On the other hand, plasmonic nano-cavities or plasmonic nano-antennas have the properties of localized surface plasmon resonances, so they can confine light into ultra-small volumes far below the diffraction limit. The high value of Q/V can be realized due to the ultra-small mode volume V .…”

“…Photonic-plasmonic hybrid microcavities have been proposed to access the regime of deep subwavelength confinement, owing to their plasmonic constituents, while at the same time inheriting larger quality factor benefiting from a dielectric microcavity characteristic. [60][61][62][63][64][65][66][67][68] Several groups have explored the hybrid systems by embedding single metal nano-particles or plasmonic nanoantennas into dielectric microcavities, such as PhC nano-cavities [43][44][45]65] and WGM microcavities. [60] The calculated results in previous reports indicate that the strength of light-matter interaction in hybrid systems is stronger than the individual constituents, and the successful fabrication of the hybrid structure in experiments makes the hybrid systems get more attention for applications in enhancing light-matter interaction.…”