JP6526876B2 - 電磁放射用のスペクトル変換素子 - Google Patents
電磁放射用のスペクトル変換素子 Download PDFInfo
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Description
電磁放射用のスペクトル変換素子であって、
それぞれがピクセル専用である複数の領域が並置された平面状支持体と、
1組の第1アンテナ(テラヘルツアンテナと称される)であって、前記平面状支持体により強固に支持され、電磁放射の波長が30μm〜3mmの場合に放射を吸収する第1のピークを有するような大きさであり、前記テラヘルツアンテナの少なくとも1つが各ピクセル領域の内部に位置する、1組の第1アンテナと、
1組の第2アンテナ(赤外線アンテナと称される)であって、同様に前記平面状支持体により強固に支持されるが、前記放射の波長が1μm〜30μmの場合に電磁放射を吸収する第2のピークを有するような大きさであり、前記赤外線アンテナの少なくとも1つが各ピクセル領域の内部に位置する、1組の第2アンテナと、を含む、スペクトル変換素子を提案する。
各テラヘルツアンテナが1μm〜300μm、および、
各赤外線アンテナが0.1μm〜5μm。
本発明の第1の態様に適合する変換素子を、前記テラヘルツ波中に設けて、前記変換素子が、前記テラヘルツ波のエネルギーから赤外線を生成するようにする工程と、
前記変換素子により生成された前記赤外線の軌道上に赤外線センサを設ける工程と、を含む、方法を提案する。
Claims (11)
- 電磁放射用のスペクトル変換素子(10)であって、
それぞれがピクセル専用である複数の領域(ZP)が並置された平面状支持体(1)と、
1組の第1アンテナ(2)(テラヘルツアンテナと称される)であって、前記平面状支持体(1)により強固に支持され、電磁放射の波長が30μm〜3mm(テラヘルツの放射に対応する)の場合に前記放射の第1吸収ピーク(P1)を有するような大きさであり、前記テラヘルツアンテナの少なくとも1つが各ピクセル領域(ZP)の内部に位置する、1組の第1アンテナ(2)と、
1組の第2アンテナ(3)(赤外線アンテナと称される)であって、同様に前記平面状支持体(1)により強固に支持されるが、前記放射の波長が1μm〜30μm(赤外線の放射に対応する)の場合に前記電磁放射の第2吸収ピーク(P2)を有するような大きさであり、前記赤外線アンテナの少なくとも1つが各ピクセル領域(ZP)の内部に位置する、1組の第2アンテナ(3)と、を含み、
前記テラヘルツアンテナ(2)のうちの1つと、前記赤外線アンテナ(3)のうちの1つは、任意の同じピクセル領域(ZP)の中にともに位置し、互いに熱的に結合しており、前記テラヘルツアンテナ(2)のうちの当該1つと前記赤外線アンテナ(3)のうちの当該1つとの熱抵抗は、前記テラヘルツアンテナおよび前記赤外線アンテナが異なるピクセル領域のそれぞれに位置している場合に前記テラヘルツアンテナの任意の1つと前記赤外線アンテナの任意の1つとのあいだに存在する互いの熱抵抗よりも低い、スペクトル変換素子(10)。 - 任意の同じピクセル領域(ZP)の中にともに位置する1つのテラヘルツアンテナ(2)と1つの赤外線アンテナ(3)との熱抵抗は、前記テラヘルツアンテナおよび前記赤外線アンテナが異なるピクセル領域のそれぞれに位置している場合に前記テラヘルツアンテナの任意の1つと前記赤外線アンテナの任意の1つとのあいだに存在する互いの熱抵抗の10分の1より低く、好ましくは100分の1より低い、請求項1に記載の変換素子(10)。
- テラヘルツアンテナ(2)または赤外線アンテナ(3)が、それぞれ金属/誘電体/金属型、あるいは、ヘルムホルツ共鳴器型、あるいは、赤外線またはテラヘルツ波を吸収する材料の一部により形成される、請求項1または2に記載の変換素子(10)。
- 各ピクセル領域(ZP)は30μm〜5000μmの横方向の寸法を有し、各テラヘルツアンテナ(2)は1μm〜300μmの横方向の寸法を有し、また、各赤外線アンテナ(3)は0.1μm〜5μmの横方向の寸法を有し、前記横方向の寸法は前記平面状支持体(1)に平行に測られたものである、請求項1から3のいずれか1項に記載の変換素子(10)。
- 前記平面状支持体(1)は、隣り合う任意の2つのピクセル領域(ZP)を連結する連結部(4)、および、各連結部を横方向に制限する凹部(5)を含み、それにより、すべての前記ピクセル領域は、前記平面状支持体中で連結されるとともに、隣り合う2つのピクセル領域間の熱拡散通路は、前記凹部のいくつかにより限定された区間を有する、請求項1から4のいずれか1項に記載の変換素子(10)。
- 各テラヘルツアンテナ(2)は、いくつかの異なる形状から選ばれる形状を有し、前記複数のテラヘルツアンテナの形状は、最大効率で吸収される前記電磁放射の異なる偏光または異なる波長に対応しており、
各ピクセル領域(ZP)は、前記複数のテラヘルツアンテナの形状(2)の少なくとも1つ、好ましくは単一のアンテナ形状を含み、前記複数のテラヘルツアンテナの形状は、異なるピクセル領域間で交替し、好ましくは、前記変換素子(10)全体では同一である交替パターンに従って、異なるピクセル領域間で交替する、請求項1から5のいずれか1項に記載の変換素子(10)。 - 一方では前記テラヘルツアンテナ(2)、他方では前記赤外線アンテナ(3)が、前記平面状支持体(1)の2つの対向面により支持され、前記熱抵抗は、両方の対向面間の前記平面状支持体を通過する熱拡散経路に沿って生じる、請求項1〜6のいずれか1項に記載の変換素子(10)。
- 前記テラヘルツアンテナ(2)および前記赤外線アンテナ(3)は、前記平面状支持体(1)の同じ面によってともに支持される、たとえば、前記平面状支持体の面上の積層の順序において、前記テラヘルツアンテナは、前記平面状支持体の前記面に支持されている層状構造(ST)の第1の部分に配置され、前記赤外線アンテナは、前記層状構造の前記第1の部分の上方または下方に位置する前記層状構造の第2の部分に配置される、請求項1〜6のいずれか1項に記載の変換素子(10)。
- テラヘルツ波(TH)を収集する方法であって、
請求項1から8のいずれか1項に適合する変換素子(10)を、前記テラヘルツ波(TH)中に設けて、前記変換素子が、前記テラヘルツ波のエネルギーから赤外線(IR)を生成するようにする工程と、
前記変換素子(10)により生成された前記赤外線(IR)の軌道上に赤外線センサ(20)を設ける工程と、を含む、方法。 - 前記赤外線センサ(20)は、前記赤外線(IR)の少なくとも一部を効率的に吸収する、少なくとも1つの光電池、1つの光導電セル、または、1つのボロメータセルを含む、請求項9に記載の方法。
- 前記赤外線センサ(20)は、前記赤外線(IR)に対する感度が高い、少なくとも1つの画像検出器を含み、
前記方法は、前記変換素子(10)の上流の前記テラヘルツ波の軌道上に前記テラヘルツ波(TH)に有効なレンズ(30)を設ける工程と、前記変換素子(10)および前記画像検出器(20)間の前記赤外線(IR)の前記軌道上に前記赤外線に有効な撮像システム(21)を設ける工程と、をさらに含み、
前記レンズ(30)は、場面の画像を、当該場面から生じる前記テラヘルツ波(TH)を用いて、前記変換素子(10)上に生成し、
前記撮像システム(21)は、前記変換素子(10)の画像を、前記変換素子により生成された前記赤外線(IR)を用いて、前記画像検出器(20)上に生成する、請求項9に記載の方法。
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FR3083333B1 (fr) * | 2018-06-28 | 2021-07-09 | Office National Detudes Rech Aerospatiales | Filtre spectral comprenant au moins deux structures de fabry-perot couplees |
CN112802827B (zh) * | 2019-11-14 | 2024-03-01 | 华为技术有限公司 | 像素结构和图像传感器 |
FR3109439B1 (fr) | 2020-04-21 | 2022-04-08 | Office National Detudes Rech Aerospatiales | Detecteur bidimensionnel de rayonnement terahertz |
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