Ultrahigh Q-factor and figure of merit Fano metamaterial based on dark ring magnetic mode

2015 ◽  
Vol 335 ◽  
pp. 60-64 ◽  
Author(s):  
Bo Wang ◽  
Zhenwei Xie ◽  
Shengfei Feng ◽  
Bo Zhang ◽  
Yan Zhang
Keyword(s):  
Figure Of Merit ◽  
Q Factor ◽  
Dark Ring ◽  
Magnetic Mode

scholarly journals Q-Factor Performance of 28 nm-Node High-K Gate Dielectric under DPN Treatment at Different Annealing Temperatures

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2086
Author(s):  
Chii-Wen Chen ◽  
Shea-Jue Wang ◽  
Wen-Ching Hsieh ◽  
Jian-Ming Chen ◽  
Te Jong ◽  
...  
Keyword(s):  
Figure Of Merit ◽  
Gate Dielectric ◽  
Gate Dielectrics ◽  
Nitrogen Concentration ◽  
Point Of View ◽  
Tunneling Effect ◽  
Q Factor ◽  
High K ◽  
Different Temperatures

Q-factor is a reasonable index to investigate the integrity of circuits or devices in terms of their energy or charge storage capabilities. We use this figure of merit to explore the deposition quality of nano-node high-k gate dielectrics by decoupled-plasma nitridation at different temperatures with a fixed nitrogen concentration. This is very important in radio-frequency applications. From the point of view of the Q-factor, the device treated at a higher annealing temperature clearly demonstrates a better Q-factor value. Another interesting observation is the appearance of two troughs in the Q-VGS characteristics, which are strongly related to either the series parasitic capacitance, the tunneling effect, or both.

scholarly journals Concurrent Quad-band Low Noise Amplifier (QB-LNA) using Multisection Impedance Transformer

2017 ◽  
Vol 7 (4) ◽  
pp. 2061
Author(s):  
Teguh Firmansyah ◽  
Anggoro Suryo Pramudyo ◽  
Siswo Wardoyo ◽  
Romi Wiryadinata ◽  
Alimuddin Alimuddin
Keyword(s):  
Figure Of Merit ◽  
Noise Figure ◽  
Impedance Matching ◽  
Low Noise ◽  
Low Noise Amplifier ◽  
Design System ◽  
Q Factor ◽  
Output Impedance ◽  
Input And Output ◽  
Noise Amplifier

<span>A quad-band low noise amplifier (QB-LNA) based on multisection impedance transformer designed and evaluated in this research. As a novelty, a multisection impedance transformer was used to produce QB-LNA. A multisection impedance transformer is used as input and output impedance matching because it has higher stability, large Q factor, and low noise than lumpedcomponent.The QB-LNA was designed on FR4 microstrip substrate with </span><span>e</span><span>r= 4.4, thickness h=0.8 mm, and tan </span><span>d</span><span>= 0.026. The proposed QB-LNA was designed and analyzed by Advanced Design System (ADS).The simulation has shown that QB-LNA achieves gain (S<sub>21</sub>) of 22.91 dB, 16.5 dB,  11.18 dB, and 7.25 dB at 0.92 GHz, 1.84 GHz, 2.61 GHz, and 3.54 GHz, respectively.The QB-LNA obtainreturn loss (S<sub>11</sub>) of -21.28 dB, -31.87 dB,  -28.08 dB, and -30.85 dB at 0.92 GHz, 1.84 GHz, 2.61 GHz, and 3.54 GHz, respectively. It also achieves a noise figure (nf) of 2.35 dB, 2.13 dB, 2.56 dB, and 3.55 dB at 0.92 GHz, 1.84 GHz, 2.61 GHz, and 3.54 GHz, respectively. This research also has shown that the figure of merit (FoM) of the proposed QB-LNA is higher than that of another multiband LNA.</span>

scholarly journals Polymer Ring Resonator with a Partially Tapered Waveguide for Biomedical Sensing: Computational Study

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5017
Author(s):  
Tayebeh Sahraeibelverdi ◽  
L. Jay Guo ◽  
Hadi Veladi ◽  
Mazdak Rad Malekshahi
Keyword(s):  
Figure Of Merit ◽  
Ring Resonator ◽  
Computational Study ◽  
Low Cost ◽  
Ring Resonators ◽  
Q Factor ◽  
Biomedical Sensing ◽  
Waveguide Width ◽  
Tapered Waveguide ◽  
Silicon Based

Ring resonators are well-known optical biosensors thanks to their relatively high Q-factor and sensitivity, in addition to their potential to be fabricated in large arrays with a small footprint. Here, we investigated the characteristics of a polymer ring resonator with a partially tapered waveguide for Biomedical Sensing. The goal is to develop a more sensitive biosensor with an improved figure of merit. The concept is more significant field interaction with the sample under test in tapered segments. Waveguide width is hereby gradually reduced to half. Sensitivity improves from 84.6 to 101.74 [nm/RIU] in a relatively small Q-factor reduction from 4.60 × 103 for a strip waveguide to 4.36 × 103 for a π/4 partially tapered one. After the study, the number of tapered parts from zero to fifteen, the obtained figure of merit improves from 497 for a strip ring to 565 for a π/4 tapered ring close to six tapered ones. Considering the fabrication process, the three-tapered one is suggested. The all-polymer material device provides advantages of a low-cost, disposable biosensor with roll-to-roll fabrication compatibility. This design can also be applied on silicon on isolator, or polymer on silicon-based devices, thereby taking advantage of a higher Q-factor and greater sensitivity.

scholarly journals Multipolar Plasmonic Resonances of Aluminum Nanoantenna Tuned by Graphene

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 185
Author(s):  
Zhendong Yan ◽  
Qi Zhu ◽  
Xue Lu ◽  
Wei Du ◽  
Xingting Pu ◽  
...  
Keyword(s):  
Electric Fields ◽  
Figure Of Merit ◽  
Near Field ◽  
Monolayer Graphene ◽  
Q Factor ◽  
Order Mode ◽  
Third Order ◽  
Resonance Strength ◽  
Refractive Index Sensing ◽  
Potential Applications

We numerically investigate the multipolar plasmonic resonances of Aluminum nanoantenna tuned by a monolayer graphene from ultraviolet (UV) to visible regime. It is shown that the absorbance of the plasmonic odd modes (l = 1 and l = 3) of graphene–Al nanoribbon structure is enhanced while the absorption at the plasmonic even modes (l = 2) is suppressed, compared to the pure Al nanoribbon structure. With the presence of the monolayer graphene, a change in the resonance strength of the multipolar plasmonic modes results from the near field interactions of the monolayer graphene with the electric fields of the multipolar plasmonic resonances of the Al resonator. In particular, a clear absorption peak with a high quality (Q)-factor of 27 of the plasmonic third-order mode (l = 3) is realized in the graphene–Al nanoribbon structure. The sensitivity and figure of merit of the plasmonic third-order mode of the proposed Graphene–Al nanoribbon structure can reach 25 nm/RIU and 3, respectively, providing potential applications in optical refractive-index sensing.

Seti Figure of Merit

1997 ◽  
Vol 161 ◽  
pp. 711-717 ◽  
Author(s):  
John W. Dreher ◽  
D. Kent Cullers
Keyword(s):  
Figure Of Merit ◽  
Qualitative Difference ◽  
Current Generation ◽  
Detection Range ◽  
Sky Surveys ◽  
Independent Observations ◽  
Good For

AbstractWe develop a figure of merit for SETI observations which is anexplicitfunction of the EIRP of the transmitters, which allows us to treat sky surveys and targeted searches on the same footing. For each EIRP, we calculate the product of terms measuring the number of stars within detection range, the range of frequencies searched, and the number of independent observations for each star. For a given set of SETI observations, the result is a graph of merit versus transmitter EIRP. We apply this technique to several completed and ongoing SETI programs. The results provide a quantitative confirmation of the expected qualitative difference between sky surveys and targeted searches: the Project Phoenix targeted search is good for finding transmitters in the 109to 1014W range, while the sky surveys do their best at higher powers. Current generation optical SETI is not yet competitive with microwave SETI.

The Measurement of Performance in Probabilistic Diagnosis IV. Utility Considerations in Therapeutics and Prognostics

1981 ◽  
Vol 20 (02) ◽  
pp. 80-96 ◽  
Author(s):  
J. D. F. Habbema ◽  
J. Hilden
Keyword(s):  
Decision Theory ◽  
Figure Of Merit ◽  
Acute Abdominal Pain ◽  
Theory Approach ◽  
Expected Loss ◽  
Patient Benefit ◽  
Evaluation Approach ◽  
Average Loss ◽  
Actual Decision ◽  
Probabilistic Diagnosis

It is argued that it is preferable to evaluate probabilistic diagnosis systems in terms of utility (patient benefit) or loss (negative benefit). We have adopted the provisional strategy of scoring performance as if the system were the actual decision-maker (not just an aid to him) and argue that a rational figure of merit is given by the average loss which patients would incur by having the system decide on treatment, the treatment being selected according to the minimum expected loss principle of decision theory.A similar approach is taken to the problem of evaluating probabilistic prognoses, but the fundamental differences between treatment selection skill and prognostic skill and their implications for the assessment of such skills are stressed. The necessary elements of decision theory are explained by means of simple examples mainly taken from the acute abdomen, and the proposed evaluation tools are applied to Acute Abdominal Pain data analysed in our previous papers by other (not decision-theoretic) means. The main difficulty of the decision theory approach, viz. that of obtaining good medical utility values upon which the analysis can be based, receives due attention, and the evaluation approach is extended to cover more realistic situations in which utility or loss values vary from patient to patient.

Proteins and direct methods

1991 ◽  
Vol 197 (3-4) ◽  
Author(s):  
Fan Hai-fu ◽  
Hao Quan ◽  
M. M. Woolfson
Keyword(s):  
First Principles ◽  
Figure Of Merit ◽  
Direct Methods ◽  
Large Structure ◽  
Low Resolution ◽  
Figures Of Merit ◽  
Large Structures ◽  
Resolution Data

AbstractConventional direct methods, which work so well for small structures, are less successful for macromolecules. Where it has been demonstrated that a solution might be found using direct methods it is then found that the usual figures of merit are unable to distinguish the few good sets of phases from the large number of sets generated. The reasons for the difficulties with very large structures are considered from a first-principles approach taking into account both the factors of having a large number of atoms and low resolution data. A proposal is made for trying to recognize good phase sets by taking a large structure as a sum of a number of smaller structures for each of which a conventional figure of merit can be applied.

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