scholarly journals Broadband plasmonic silver nanoflowers for high-performance random lasing covering visible region

Nanophotonics ◽  
2017 ◽  
Vol 6 (5) ◽  
pp. 1151-1160 ◽  
Author(s):  
Qing Chang ◽  
Xiaoyu Shi ◽  
Xuan Liu ◽  
Junhua Tong ◽  
Dahe Liu ◽  
...  
Keyword(s):  
Quality Factor ◽  
High Performance ◽  
Coupling Effect ◽  
Synthesis Method ◽  
Visible Region ◽  
High Quality Factor ◽  
Visible Range ◽  
Random Lasing ◽  
High Quality ◽  
Random Lasers

AbstractMulticolor random lasing has broad potential applications in the fields of imaging, sensing, and optoelectronics. Here, silver nanoflowers (Ag NF) with abundant nanogaps are fabricated by a rapid one-step solution-phase synthesis method and are first proposed as effective broadband plasmonic scatterers to achieve different color random lasing. With abundant nanogaps and spiky tips near the surface and the interparticle coupling effect, Ag NFs greatly enhance the local electromagnetic field and induce broadband plasmonic scattering spectra over the whole visible range. The extremely low working threshold and the high-quality factor for Ag NF-based random lasers are thus demonstrated as 0.24 MW cm−2 and 11,851, respectively. Further, coherent colorful random lasing covering the visible range is realized using the dye molecules oxazine (red), Coumarin 440 (blue), and Coumarin 153 (green), showing high-quality factor of more than 10,000. All these features show that Ag NF are highly efficient scatterers for high-performance coherent random lasing and colorful random lasers.

Random Lasing with a High Quality Factor over the Whole Visible Range Based on Cascade Energy Transfer

2013 ◽  
Vol 2 (1) ◽  
pp. 88-93 ◽  
Author(s):  
Xiaoyu Shi ◽  
Yanrong Wang ◽  
Zhaona Wang ◽  
Sujun Wei ◽  
Yanyan Sun ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quality Factor ◽  
High Quality Factor ◽  
Visible Range ◽  
Random Lasing ◽  
High Quality ◽  
Cascade Energy

Effect of Imperfections on Fused Silica Shell Resonators

2014 ◽  
Author(s):  
Ali Darvishian ◽  
Behrouz Shiari ◽  
Jae Yoong Cho ◽  
Khalil Najafi
Keyword(s):  
Quality Factor ◽  
High Performance ◽  
Silica Shell ◽  
Fused Silica ◽  
High Quality Factor ◽  
High Quality ◽  
Geometric Imperfection ◽  
Mass Imbalance ◽  
Resonance Frequencies ◽  
Frequency Split

Axisymmetric shell resonators have been attractive candidates for high performance MEMS vibratory gyroscopes because of their high quality factor, low sensitivity to environmental vibrations and electrostatic tuning capability. Fused silica shell resonators made by blow torch molding with high quality factor could perform as high performance MEMS gyroscopes. Despite such advantageous features, the performance of these shell resonators is limited by geometric imperfections that occur during fabrication. This paper investigates effect of geometric asymmetries such as height and radius imperfections, notch, and mass imbalance in the rim of gyroscopes on the split in natural frequencies of the n=2 wineglass modes. Numerical simulation shows that perfect fused silica shell has 13929 Hz natural resonance frequencies without any frequency split. Analysis of imperfect shell reveals that frequency split is very sensitive to edge geometric imperfection and mass imbalance in the rim. On the other hand, Δf is not very sensitive to the notch in the rim of shell and height imperfection less than 40μm.

scholarly journals High Quality Factor, High Sensitivity Metamaterial Graphene—Perfect Absorber Based on Critical Coupling Theory and Impedance Matching

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 95 ◽  
Author(s):  
Chunlian Cen ◽  
Zeqiang Chen ◽  
Danyang Xu ◽  
Liying Jiang ◽  
Xifang Chen ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Quality Factor ◽  
Near Infrared ◽  
Coupling Effect ◽  
Impedance Matching ◽  
High Quality Factor ◽  
Monolayer Graphene ◽  
Perfect Absorber ◽  
Critical Coupling ◽  
High Quality

By means of critical coupling and impedance matching theory, we have numerically simulated the perfect absorption of monolayer graphene. Through the critical coupling effect and impedance matching, we studied a perfect single-band absorption of the monolayer graphene and obtained high quality factor (Q-factor = 664.2) absorption spectrum which has an absorbance close to 100% in the near infrared region. The position of the absorption spectrum can be adjusted by changing the ratio between the radii of the elliptic cylinder air hole and the structural period. The sensitivity of the absorber can be achieved S = 342.7 nm/RIU (RIU is the per refractive index unit) and FOM = 199.2 (FOM is the figure of merit), which has great potential for development on biosensors. We believe that our research will have good application prospects in graphene photonic devices and optoelectronic devices.

A Long Bar Type Silicon Resonator with a High Quality Factor

2014 ◽  
Vol 134 (2) ◽  
pp. 26-31 ◽  
Author(s):  
Nguyen Van Toan ◽  
Masaya Toda ◽  
Yusuke Kawai ◽  
Takahito Ono
Keyword(s):  
Quality Factor ◽  
High Quality Factor ◽  
High Quality ◽  
Type Silicon ◽  
Silicon Resonator

scholarly journals Coherent suppression of backscattering in optical microresonators

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Andreas Ø. Svela ◽  
Jonathan M. Silver ◽  
Leonardo Del Bino ◽  
Shuangyou Zhang ◽  
Michael T. M. Woodley ◽  
...  
Keyword(s):  
Quality Factor ◽  
Bulk Material ◽  
Near Field ◽  
High Quality Factor ◽  
Dual Frequency ◽  
High Quality ◽  
Frequency Combs ◽  
Optical Microresonators ◽  
Whispering Gallery ◽  
The Stability

AbstractAs light propagates along a waveguide, a fraction of the field can be reflected by Rayleigh scatterers. In high-quality-factor whispering-gallery-mode microresonators, this intrinsic backscattering is primarily caused by either surface or bulk material imperfections. For several types of microresonator-based experiments and applications, minimal backscattering in the cavity is of critical importance, and thus, the ability to suppress backscattering is essential. We demonstrate that the introduction of an additional scatterer into the near field of a high-quality-factor microresonator can coherently suppress the amount of backscattering in the microresonator by more than 30 dB. The method relies on controlling the scatterer position such that the intrinsic and scatterer-induced backpropagating fields destructively interfere. This technique is useful in microresonator applications where backscattering is currently limiting the performance of devices, such as ring-laser gyroscopes and dual frequency combs, which both suffer from injection locking. Moreover, these findings are of interest for integrated photonic circuits in which back reflections could negatively impact the stability of laser sources or other components.

Multifold coupling enabled high quality factor toroidal resonances in metasurfaces

2020 ◽  
Vol 127 (19) ◽  
pp. 193103
Author(s):  
Deepak Kumar ◽  
Surya Pranav Ambatipudi ◽  
Sabyasachi Banerjee ◽  
Ranjan Kumar ◽  
Dibakar Roy Chowdhury
Keyword(s):  
Quality Factor ◽  
High Quality Factor ◽  
High Quality

scholarly journals Fabricating centimeter-scale high quality factor two-dimensional periodic photonic crystal slabs

2014 ◽  
Vol 22 (3) ◽  
pp. 3724 ◽  
Author(s):  
Jeongwon Lee ◽  
Bo Zhen ◽  
Song-Liang Chua ◽  
Ofer Shapira ◽  
Marin Soljačić
Keyword(s):  
Photonic Crystal ◽  
Quality Factor ◽  
High Quality Factor ◽  
Two Dimensional ◽  
High Quality ◽  
Photonic Crystal Slabs
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