関連する実験動画
Updated: May 10, 2026

07:51
Fabrication of Silica Ultra High Quality Factor Microresonators
Published on: July 2, 2012
16.6K
CO2センシングのための眼形ダブルスロットGaAsマイクロリング共振器の設計とモデリング
Faezeh Pakfetrat1, Mahdi Bahadoran2, Shadab Dabagh3,4
1Department of Physics, Shiraz University of Technology, Shiraz,, 31371555, Fars, Iran.
Scientific reports
|August 29, 2025
まとめ
新しい眼形マイクロリング共振器 (ESMRR) は,二酸化炭素 (CO2) の検出に非常に敏感です. この新しい装置は低検出限界を達成し,環境と健康のモニタリングに不可欠です.
科学分野:
- フォトニクスと光学センサー
- 環境モニタリング技術
- センサーのための材料科学
背景:
- 二酸化炭素 (CO2) のモニタリングは環境と人間の健康にとって不可欠です.
- 既存のガスセンサーには必要な感度と解像度が欠けていることが多い.
- 屈折指数 (RI) センサーは,敏感なガスの検出に有望な道を提供します.
研究 の 目的:
- ガス媒体を検出するための新しい高感度RIセンサーを設計し,数値的に評価する.
- 感知性能を向上させるため,目型のマイクロリング共振器 (ESMRR) 構造を調査する.
- 精密な二酸化炭素 (CO2) 監視のためのセンサーの適性を評価する.
主な方法:
- ダブルスロットマイクロリング共鳴器構造の数値シミュレーションと設計.
- Al0.5Ga0.5As基板にGaAsのダブルスロットコア波導体を使用しています.
- 光学変換関数の導出と数値解析のためのvar-FDTDを適用する.
主要な成果:
- 137.68 nmの拡張された自由スペクトル範囲 (FSR) を達成した.
- 1217.39 nm/RIUと4.93 × 10−6 RIUの解像度を示した.
- 検出限界は0.82ppmで,CO2の感度が24.4ppmと報告されています.
結論:
- 提案されたESMRRセンサは高感度で高解像度でガスを検出します.
- センサーの設計は二酸化炭素 (CO2) の正確なモニタリングに有効です.
- この技術は環境と健康の安全性への応用が可能です
関連する概念動画
Cascaded Op Amps
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
Instrumentation Amplifier
An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
MOSFET Amplifiers
The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
Design Example: Capacitance Multiplier Circuit
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

