双波長ナノアンテナでの分子周波数向上による中赤外線検出

Angelos Xomalis¹, Xuezhi Zheng^1,2, Rohit Chikkaraddy¹

¹NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK.

Science (New York, N.Y.)

|December 2, 2021

まとめ

研究者はプラズモンのナノ空洞と表面強化ラーマン散乱 (SERS) を使用して,可視光周波数への重要な赤外線アップコンバージョンを達成しました. この突破は,室温でMIR検出の感度を高めています.

科学分野:

オプトメカニクス
プラズモニック
ナノフォトニクス

背景:

光学相互作用は,光学領域と機械領域間の信号変換を可能にします.
光をナノスケールに制限することで光と物質の結合が強化され単光子の感受性が得られます
中赤外線 (MIR) 検出は様々な用途に不可欠です.

研究の目的:

赤外線を可視光に変換する
プラズモンのナノカビリティ内の分子振動を利用して信号変換を強化する.
赤外線検出で高い感度と増幅を実現します.

主な方法:

プラズモンのナノキャビティと二重共鳴アンテナを使う
表面強化ラーマン分散 (SERS) を利用して周波数向上変換する.
増幅のための分子振動周波数にMIRポンプを調節する.

主要な成果:

~10ミクロン波長の光を可視光に変換した.
SERSを使用してアップコンバージョンの効率を 10 倍以上向上させました.
SERSの反ストックスの放出を 140%増幅した.
室温で1〜10マイクロワット/平方マイクロメートルの検出可能な最も低い電力を得ました.

結論:

効率的な赤外線から可視光への周波数アップコンバージョンの方法を開発しました.
この技術は低コストで大規模な赤外線検出器の可能性を示しています
感度が向上した先端のスペクトロスコープ技術への道を開く.

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