scholarly journals Terahertz High-Q Absorber Based on Holes Array Perforated into a Metallic Slab

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1860
Author(s):  
Saeedeh Barzegar-Parizi ◽  
Amir Ebrahimi
Keyword(s):  
Normal Incidence ◽  
Hole Array ◽  
Quality Factors ◽  
Absorption Bands ◽  
High Quality ◽  
Analysis And Design ◽  
High Q ◽  
Resonance Frequencies ◽  
Quality Factor Q ◽  
Very High

In this paper, we theoretically analyze and design a dual-narrowband terahertz (THz) absorber based on a hole array drilled into a metallic slab. A very high-quality factor (Q) is achieved at both of the resonance frequencies. A circuit model-based approach is developed for the analysis and design of the proposed absorber. The absorption peaks occur at 2.46 and 3.75 THz frequencies with 98% and 96% absorptions at normal incidence, respectively. The achieved quality factors are 149 and 144, at 50% absorbance for the two absorption bands, respectively.

scholarly journals Fabrication of Crystalline Microresonators of High Quality Factors with a Controllable Wedge Angle on Lithium Niobate on Insulator

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1218 ◽  
Author(s):  
Jianhao Zhang ◽  
Zhiwei Fang ◽  
Jintian Lin ◽  
Junxia Zhou ◽  
Min Wang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Femtosecond Laser ◽  
Wedge Angle ◽  
Quality Factors ◽  
High Quality ◽  
Surface Smoothness ◽  
High Q ◽  
Q Factors

We report the fabrication of crystalline microresonators of high quality (Q) factors with a controllable wedge angle on lithium niobate on insulator (LNOI). Our technique relies on a femtosecond laser assisted chemo-mechanical polish, which allows us to achieve ultrahigh surface smoothness as critically demanded by high Q microresonator applications. We show that by refining the polish parameters, Q factors as high as 4.7 × 107 can be obtained and the wedge angle of the LNOI can be continuously tuned from 9° to 51°.

scholarly journals Versatile architecture of ultra-narrow band absorbing photonic nanostructure

2020 ◽  
Vol 238 ◽  
pp. 05005
Author(s):  
Clément Verlhac ◽  
Hasnaa El-Ouazzani ◽  
Mathilde Makhsiyan ◽  
Riad Haidar ◽  
Jérôme Primot ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Loss Rate ◽  
Narrow Band ◽  
Quality Factors ◽  
High Quality ◽  
Precise Control ◽  
Guided Mode ◽  
Very High ◽  
Metallic Waveguide ◽  
Mode Resonator

Ultra narrow-band absorbing surfaces answer a growing demand of precise control of absorption spectra. Starting from a design of guided mode resonator (GMR), we present here a versatile architecture presenting resonances of very high quality factors (up to 10 000) and spectrally adjustable. This design uses multiple slices of dielectrics to focus resonating field in the middle of a metallic waveguide, diminishing its extension in the metal and thus the loss rate of the propagating mode.

Analyzes of very high-q quartz crystal aimed to high quality 5 MHz resonators achievement

2010 ◽  
Author(s):  
J. Imbaud ◽  
J.J. Boy ◽  
J.P. Romand ◽  
J. Frayret ◽  
D. Picchedda ◽  
...  
Keyword(s):  
Quartz Crystal ◽  
High Quality ◽  
High Q ◽  
Very High

scholarly journals Fabrication of Crystalline Microresonators of High Quality Factors with a Controllable Wedge Angle on Lithium Niobate on Insulator

2019 ◽  
Author(s):  
Jianhao Zhang ◽  
Zhiwei Fang ◽  
Jintian Lin ◽  
Junxia Zhou ◽  
Min Wang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Femtosecond Laser ◽  
Wedge Angle ◽  
Quality Factors ◽  
High Quality ◽  
Surface Smoothness ◽  
High Q ◽  
Q Factors

We report fabrication of crystalline microresonators of high quality (Q) factors with a controllable wedge angle on lithium niobate on insulator (LNOI). Our technique relies on femtosecond laser assisted chemo-mechanical polish which allows us to achieve ultrahigh surface smoothness as critically demanded by high Q microresonator applications. We show that by refining the polish parameters, Q factors as high as 4.7 × 107 can be obtained and the wedge angle of the LNOI can be continuously tuned from 9° to 51°.

scholarly journals Submicron-diameter semiconductor pillar microcavities with very high quality factors

2007 ◽  
Vol 90 (9) ◽  
pp. 091120 ◽  
Author(s):  
G. Lecamp ◽  
J. P. Hugonin ◽  
P. Lalanne ◽  
R. Braive ◽  
S. Varoutsis ◽  
...  
Keyword(s):  
Quality Factors ◽  
High Quality ◽  
Very High

Structural changes in silicon-on-insulator material during post-implantation annealing

1986 ◽  
Vol 44 ◽  
pp. 736-737
Author(s):  
C. O. Jung ◽  
S. J. Krause ◽  
S.R. Wilson
Keyword(s):  
Integrated Circuits ◽  
Oxide Layer ◽  
High Speed ◽  
Structural Changes ◽  
Device Fabrication ◽  
Silicon On Insulator ◽  
High Quality ◽  
Radiation Hardened ◽  
Post Implantation ◽  
Very High

Silicon-on-insulator (SOI) structures have excellent potential for future use in radiation hardened and high speed integrated circuits. For device fabrication in SOI material a high quality superficial Si layer above a buried oxide layer is required. Recently, Celler et al. reported that post-implantation annealing of oxygen implanted SOI at very high temperatures would eliminate virtually all defects and precipiates in the superficial Si layer. In this work we are reporting on the effect of three different post implantation annealing cycles on the structure of oxygen implanted SOI samples which were implanted under the same conditions.

Constructed reed beds: appropriate technology for small communities

1995 ◽  
Vol 32 (3) ◽  
pp. 339-348 ◽  
Author(s):  
M. B. Green ◽  
J. Upton
Keyword(s):  
Sewage Treatment ◽  
Appropriate Technology ◽  
Great Promise ◽  
High Quality ◽  
Reed Beds ◽  
Small Communities ◽  
Operational Information ◽  
Reed Bed ◽  
Small Sites ◽  
Very High

Reed bed treatment is put in the context of a major water company’s need to provide reliable, high quality, effluents from small sewage treatment works whilst seeking to minimise running costs. Design and operational information is given for reed bed applications in Severn Trent Water. Performance details are provided for application to secondary, tertiary and storm overflow treatment. The results give particular confidence in the system’s ability to deliver very high quality effluents when used for tertiary treatment, the company’s biggest application. Reed beds work well against less demanding criteria for secondary treatment at small sites and show great promise for storm overflow treatment.

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