Single-mode lasing of nanowire self-coupled resonator

Abstract

We report the observation of optically pumped lasing in self-coupled resonators constructed with dye-doped polymer nanowires. Three nanowires with a diameter of 350 nm, 360 nm and 500 nm were fabricated into different self-coupled resonators and single-mode lasing emission was obtained. The self-coupled resonators can be utilized to realize tunable laser systems and enhance the coupling efficiency of emission in ultrasmall resonators.

Dispersing upconversion nanocrystals in a single silicon microtube

“…Figure 2c shows the relationship of normalized photoluminescence (PL) spectra intensity and propagation distance, with the inset being a dark-filed PL microscope image of this Tm 3+ -UCNCs-MT (diameter ~2 μm). Here, by studying the image brightness, as used in previous work2829, the normalized PL intensity of the emission light can thus be calculated. The PL intensity of the output spot is normalized against the excited spot, and then the decay of the guided normalized PL intensity dependent propagation distance ( d ) is obtained.…”

Coupled Polymer Microfiber Lasers for Single Mode Operation and Enhanced Refractive Index Sensing

“…[10][11][12][13][14] This technique is label-free and ultra-sensitive down to the level of nanoparticles, viruses, and even single molecules. However, these two factors are normally confl icting in a single cavity.Recently, investigations on coupled WGCs have demonstrated many interesting phenomena like induced transparency and absorption, slow light, [ 15,16 ] directional and single mode emission, [17][18][19][20][21][22] and enhancement of sensor's sensitivity. However, these two factors are normally confl icting in a single cavity.…”

“…[26][27][28] For WGCs, single mode operation can be obtained by reducing the cavity size, [ 29 ] but this method deteriorates laser Q factor. [17][18][19][20][21][22][23][24] Compared to traditional semiconductor and inorganic onedimensional cavities, organic nano/microfi bers possess simpler fabrication and better mechanical fl exibility, thus are attractive for fl exible optoelectronics and nanophotonics. [ 19,20 ] Coupled WGCs have been explored in microdisks, optofl uidic ring resonators, and silica/glass fi bers.…”

“…Recently, investigations on coupled WGCs have demonstrated many interesting phenomena like induced transparency and absorption, slow light, [ 15,16 ] directional and single mode emission, [17][18][19][20][21][22] and enhancement of sensor's sensitivity. [ 23,24 ] Single mode lasing is signifi cant for integrated photonics and on-chip applications.…”

“…The alternative solution without deteriorating the Q factor is to use coupled WGCs, in which single mode emission is generated through Vernier effect. [17][18][19][20][21][22][23][24] Compared to traditional semiconductor and inorganic onedimensional cavities, organic nano/microfi bers possess simpler fabrication and better mechanical fl exibility, thus are attractive for fl exible optoelectronics and nanophotonics. [17][18][19][20][21][22][23][24] Compared to traditional semiconductor and inorganic onedimensional cavities, organic nano/microfi bers possess simpler fabrication and better mechanical fl exibility, thus are attractive for fl exible optoelectronics and nanophotonics.…”