- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Large area silicon-air-silicon DBRs for infrared filter applications
摘要： This paper presents the design, fabrication, and optical characterization of silicon-based thin film Fabry-Pérot filters for spectroscopic sensing applications at short-wave infrared (SWIR: 1.5–2.5 μm) and mid-wave infrared (MWIR: 3–5 μm) wavelengths. Filter performance is enhanced using distributed Bragg reflectors composed of silicon and air-gap layers for enhanced refractive index contrast. A peak-to-peak surface variation of less than 20 nm in the fabricated micromachined structures was achieved across a large spatial area of 1 mm × 1 mm. Spectral measurements on released Fabry-Pérot filters show excellent agreement with optical simulations. The fabricated Fabry-Pérot filters demonstrate peak transmittance values greater than 50% across all spectral ranges, with measured full width at half maximum values in the range of 50 nm rendering them suitable for use in spectral sensing and imaging in the SWIR and MWIR wavelength ranges.
关键词： Silicon,Fabry-Perot interferometers,Spectroscopy,Optical device fabrication
更新于2025-09-23 15:22:29
-
[IEEE NAECON 2018 - IEEE National Aerospace and Electronics Conference - Dayton, OH, USA (2018.7.23-2018.7.26)] NAECON 2018 - IEEE National Aerospace and Electronics Conference - Electromagnetic Propagation across an Achiral/Chiral (Dispersive) Boundary Using Phasor Approach to Fresnel Coefficients
摘要： Electromagnetic propagation across an achiral/chiral interface has been studied to evaluate Fresnel coefficients and examine the propagation characteristics. Extending the problem to include dispersive chiral dielectrics and discrete components may lead to potential applications such as tunable superlenses (with imaging and vision implications) and also devices including chiral Fabry-Perot etalons.
关键词： Fresnel coefficients,chiral Fabry-Perot resonator,metamaterials,chiral media,internal reflection,anomalous Brewster phenomenon
更新于2025-09-23 15:22:29
-
Fiber Optic Fabry-Perot Pressure Sensor with Embedded MEMS Micro-Cavity for Ultra-High Pressure Detection
摘要： we demonstrate a fiber-optic Fabry-Perot pressure sensor with embedded MEMS micro-cavity for ultra-high pressure detection. The embedded type structure (ETS) is first proposed and analyzed to meet the requirements of ultra-high pressure detection. The geometry parameters of sensor have been optimized by analyzing mechanical and optical characteristics. From the analysis results based on the ETS, an ultra-high pressure sensor is fabricated and experimentally demonstrated for ultra-high pressure detection. The ultra-high pressure experiment illustrated response relationship between the absolute phase and pressure in the range of 2~120MPa, and full-scale errors less than 0.079%F.S. at room temperature. The other characteristics index of sensor, such as pressure sensitivity, hysteresis error, temperature’s influence factor are superior to rad/ ℃ . The transient response time of system is 0.27s. The sensor can be used for ultra-high pressure detections, which is necessary in deep-sea and oil exploration.
关键词： Pressure detection,Fabry-Perot,Fiber optic sensor
更新于2025-09-23 15:21:21
-
Fabry–Perot Cavity Sensing Probe with High Thermal Stability for an Acoustic Sensor by Structure Compensation
摘要： Fiber Fabry–Perot cavity sensing probes with high thermal stability for dynamic signal detection which are based on a new method of structure compensation by a proposed thermal expansion model, are presented here. The model reveals that the change of static cavity length with temperature only depends on the thermal expansion coefficient of the materials and the structure parameters. So, fiber Fabry–Perot cavity sensing probes with inherent temperature insensitivity can be obtained by structure compensation. To verify the method, detailed experiments were carried out. The experimental results reveal that the static cavity length of the fiber Fabry–Perot cavity sensing probe with structure compensation hardly changes in the temperature range of ?20 to 60 °C and that the method is highly reproducible. Such a method provides a simple approach that allows the as-fabricated fiber Fabry–Perot cavity acoustic sensor to be used for practical applications, exhibiting the great advantages of its simple architecture and high reliability.
关键词： high thermal stability,thermal expansion model,structure compensation,Fabry–Perot cavity,acoustic sensor
更新于2025-09-23 15:21:21
-
ELECTRODELESS MEASUREMENT TECHNIQUE OF COMPLEX DIELECTRIC PERMITTIVITY OF HIGH-K DIELECTRIC FILMS IN THE MILLIMETER WAVELENGTH RANGE
摘要： An electrodeless measurement technique of complex dielectric permittivity of high-K dielectric ?lms is described. The technique is based on a quasi-optic Fabry-Perot resonator and modi?ed for investigation of two-layer dielectric structures — substrate/K-?lm. This procedure is destined to be used for providing a simple intermediate control of parameters of high-K ?lms before the following technological process. Regimes of measurements providing the most sensitive conditions for de?nition of ?lm parameters are considered. The proposed method is tested on two-layer structures with well-known parameters and is used for characterization of ferroelectric (Ba,Sr)TiO3 ?lms in the millimeter wavelength range (～ 50 GHz).
关键词： Fabry-Perot resonator,complex dielectric permittivity,electrodeless measurement,millimeter wavelength range,high-K dielectric films
更新于2025-09-23 15:21:21
-
Low-profile wideband Fabry-Perot resonator antenna using artificial magnetic conductor surface
摘要： A low-profile, high gain Fabry-Perot Resonator antenna with a wide operation bandwidth (BW) is presented in this paper. The proposed design consists of an ellipse-shaped dipole as a wideband radiating source, which is reflected by an artificial magnetic conductor ground plane to achieve low-profile structure. The antenna gain can be significantly enhanced by the use of a half-wavelength-thick dielectric slab as a partial reflecting surface. Additionally, this dielectric slab also contributes to improving the radiation pattern characteristics of the proposed design, especially in the high frequency region. A final prototype with an overall size of 1.2λL × 1.2λL × 0.4λL (λL is free-space wavelength at the lowest frequency of 3-dB gain BW) has been fabricated to validate the concept. The measured results show that the proposed antenna yielded a wide 3-dB gain BW of approximately 50.3% with a peak gain of 14 dBi and impedance matching BW of 48.9%.
关键词： high gain,wideband,artificial magnetic conductor,half-wavelength dielectric slab,Fabry-Perot antenna,low profile
更新于2025-09-23 15:21:21
-
[IEEE 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Odessa, Ukraine (2018.9.4-2018.9.7)] 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Polarization Properties of the Fabry-Perot Resonator with Coaxial-Sector Apertures in Mirrors
摘要： Numerical electrodynamic properties of the Fabry-Perot resonator with coaxial-sector apertures and waveguide loads have been performed. The possibility of obtaining the circular polarization of the electric field in the volume of the resonator is revealed. It is shown that the polarization of the electric field in the resonator volume can be controlled by changing the distance between the mirrors or the length of the shorted waveguides of one of the mirrors.
关键词： the Stokes parameters,Fabry-Perot resonator,coaxial-sector waveguide
更新于2025-09-23 15:21:21
-
Planar hot-electron photodetector utilizing high refractive index MoS<sub>2</sub> in fabry-p??rot perfect absorber
摘要： Hot electron photodetection (HEPD) excited by surface plasmon can circumvent bandgap limitations, opening pathways for additional energy harvesting. However, the costly and time-consuming lithography and electron beam lithography-free hot electron photodetector based on the Fabry-Pérot resonance has long been a barrier for large-area and mass production of HEPD. In this paper, we proposed a planar and electron beam lithography-free hot electron photodetector based on the Fabry-Pérot resonance composed of Au/MoS2/Au cavity. The hot electron photodetector has a nanoscale thickness, high spectral tenability, and multicolour photoresponse in the near-infrared region due to the increased round-trip phase shift by using high refractive index MoS2. We predict that the photoresponsivity can achieve up to 23.6 mA/W when double cavities are integrated with the Fabry-Pérot cavity. The proposed hot electron photodetector that has a nanoscale thickness and planar stacking is a perfect candidate for large-area and mass production of HEPD.
关键词： Hot electron,photodetection,Molybdenum disulphide,Fabry-Pérot resonance,perfect absorption
更新于2025-09-23 15:21:01
-
On the performance of wavelength meters: Part 1a??consequences for medium-to-high-resolution laser spectroscopy
摘要： Present-day laser-spectroscopy experiments increasingly rely on modern commercial devices to monitor, stabilize, and scan the wavelength of their probe laser. Recently, new techniques are capable of achieving unprecedented levels of precision on atomic and nuclear observables, pushing these devices to their performance limits. Considering the fact that these observables themselves are deduced from the frequency difference between specific atomic resonances, in the order of MHz–GHz, the uncertainty on the output of the device measuring the wavelength is often directly related to the final systematic uncertainty on the experimental results. Owing to its importance, the performance of several commercial wavelength meters was compared against different reference sources, including a Scanning Fabry–Pérot Interferometer (SFPI) and a frequency comb. Reproducible, wavelength- and device-dependent disagreements are observed, potentially skewing the experimental output at high precision. In this paper, a practical and relatively inexpensive wavelength meter characterization procedure is presented and validated. This method is capable of improving the precision on wavelength differences considerably depending on the device, while together with a second investigation that is published separately, (K?nig et al., in Appl Phys B, 2020), it offers a full description of the expected wavelength meter performance for users.
关键词： frequency comb,hyperfine structure,laser spectroscopy,wavelength meters,Scanning Fabry–Pérot Interferometer
更新于2025-09-23 15:21:01
-
[IEEE 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - HangZhou, China (2018.9.5-2018.9.7)] 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - A Fabry-Perot Resonator Antenna based on Graphene Patch Array
摘要： In order to achieve a high directivity antenna for terahertz, an improved Fabry-Perot resonator antenna based on graphene is proposed. The antenna consists of a graphene patch array on a grounded dielectric and a rectangle waveguide. According to the theory of Fabry-Perot resonant cavity, the directivity of antenna will increase obviously by choosing proper chemical potential of graphene and appropriate distance of resonant cavity. The radiation pattern of antenna also changes with the chemical potential.
关键词： Terahertz,Antenna,Graphene,tunability,Fabry-Perot resonator
更新于2025-09-23 15:21:01