JP5488469B2 - 光学式センサーおよびその製造方法並びに光学式センサーを用いた検出方法 - Google Patents
光学式センサーおよびその製造方法並びに光学式センサーを用いた検出方法 Download PDFInfo
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Classifications
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
- G01N21/554—Attenuated total reflection and using surface plasmons detecting the surface plasmon resonance of nanostructured metals, e.g. localised surface plasmon resonance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
- G02B1/005—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of photonic crystals or photonic band gap materials
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G02B5/008—Surface plasmon devices
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/1225—Basic optical elements, e.g. light-guiding paths comprising photonic band-gap structures or photonic lattices
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Description
しかしながら、SPR法の場合、共鳴角シフトを検出するために大型の光学系を構築する必要があるとともに、一連の操作が煩雑である。そのためオンサイトでの被検出物のモニタリングに適さない。また、QCM法では、簡便に測定は可能ではあるが、ノイズが大きく、高感度測定には適さない。そしてカンチレバー法ではデバイス作製が非常に困難という点とともに、簡易測定には適さないという問題がある。
2 凹凸構造
3 金属層
21 光
22 反射光
23 透過光
30 光源
40 光検出手段
50 情報処理手段
λ:反射光の波長
d:孔同士の距離
θ:光の入射角
na:平均屈折率
f:孔が占める面積占有率
nhole:孔の屈折率
nmedium:孔の周囲の媒質の屈折率
とすると、ブラッグの式より、
と表すことができる。
(1)まず、被検出物等が吸着されていない状態の光学式センサー1に光21を照射し、反射光22の光学特性、特に、反射光のピーク波長や強度に関する情報を取得する(図1又は図10参照)。光源30としてはどのようなものでも良いが、例えば、タングステン・ハロゲン光源や発光ダイオード、LED、重水素ランプ、有機EL、レーザー等を用いれば良い。また、反射光を検出する光検出手段40には、例えば、マルチチャンネル分光器やCCDイメージセンサー、CMOSセンサー等を用いることができる。また、取得した情報の処理には、コンピュータ等の情報処理手段50を用いれば良い。
(2)次に、被検出物が含まれ得る試料を本発明の光学式センサー1の凹凸構造2上に接触させた後、同様に反射光22の光学特性に関する情報を取得する。
(3)最後に、光学式センサーから反射される光の光学特性と、凹凸構造2に試料を接触させた後の光学式センサーから反射される光の光学特性とを比較することにより、溶液中に含まれる被検出物の有無や量を検出する。
(1)まず、被検出物等が吸着されていない状態の光学式センサー1に光21を照射し、透過光23の光学特性、特に、透過光23のピーク波長や強度に関する情報を取得する。
(2)次に、被検出物が含まれ得る試料を本発明の光学式センサー1の凹凸構造2上に接触させた後、同様に透過光23の光学特性に関する情報を取得する。
(3)最後に、光学式センサーを透過した光の光学特性と、凹凸構造2に試料を接触させた後の光学式センサーを透過した光の光学特性とを比較することにより、溶液中に含まれる被検出物の有無や量を検出する。
Claims (12)
- 所定の被検出物を検出するための光学式センサーであって、
フォトニック結晶として機能する凹凸構造と、前記凹凸構造の表面に形成され局在表面プラズモン共鳴を励起可能な金属層を具備し、前記凹凸構造から反射される光のピーク波長と前記金属層で吸収される光のピーク波長との差が10nm以下であることを特徴とする光学式センサー。 - 前記凹凸構造は、50〜500nmの範囲内の一定の直径を有する柱又は孔を50〜1000nmの範囲内の一定の間隔で二次元的に周期配列したものであることを特徴とする請求項1記載の光学式センサー。
- 前記金属層は、膜厚が5〜200nmであることを特徴とする請求項1又は2記載の光学式センサー。
- 前記金属層は、表面に前記被検出物を吸着する吸着素子を具備することを特徴とする請求項1ないし3のいずれかに記載の光学式センサー。
- 前記凹凸構造は、環状オレフィン系樹脂、アクリル樹脂、ポリカーボネート、ビニルエーテル樹脂、フッ素樹脂、ポリエステル系樹脂のいずれかによって形成されたものであることを特徴とする請求項1ないし4のいずれかに記載の光学式センサー。
- 前記凹凸構造は、インプリント技術によって形成されたものであることを特徴とする請求項1ないし5のいずれかに記載の光学式センサー。
- 前記凹凸構造は、表面に前記被検出物を吸着する吸着素子を具備することを特徴とする請求項1ないし6のいずれかに記載の光学式センサー。
- フォトニック結晶として機能する凹凸構造と、局在表面プラズモン共鳴を励起可能な金属層を有し、所定の被検出物を検出するための光学式センサーの製造方法であって、
前記凹凸構造から反射される光のピーク波長と前記金属層で吸収される光のピーク波長との差が10nm以下となるように、前記凹凸構造を形成する凹凸構造形成工程と、
前記金属層を、前記凹凸構造の表面に形成する金属層形成工程と、
を有することを特徴とする光学式センサーの製造方法。 - 前記凹凸構造形成工程は、前記凹凸構造をインプリント技術によって形成することを特徴とする請求項8記載の光学式センサーの製造方法。
- 前記金属層形成工程は、前記金属層を物理気相成長法(PVD)、化学気相成長法(CVD)、メッキ法のいずれかによって形成することを特徴とする請求項8又は9記載の光学式センサーの製造方法。
- 試料中に含まれる被検出物を検出するための検出方法であって、
フォトニック結晶として機能する凹凸構造と、前記凹凸構造の表面に形成され局在表面プラズモン共鳴を励起可能な金属層とを有し、前記凹凸構造から反射される光のピーク波長と前記金属層で吸収される光のピーク波長との差が10nm以下である光学式センサーを用意し、
前記光学式センサーから反射される光の特性と、前記凹凸構造に前記試料を接触させた後の前記光学式センサーから反射される光の特性と、を比較することにより、前記溶液中に含まれる被検出物を検出することを特徴とする検出方法。 - 試料中に含まれる被検出物を検出するための検出方法であって、
フォトニック結晶として機能する凹凸構造と、前記凹凸構造の表面に形成され局在表面プラズモン共鳴を励起可能な金属層とを有し、前記凹凸構造から反射される光のピーク波長と前記金属層で吸収される光のピーク波長との差が10nm以下である光学式センサーを用意し、
種々の濃度の被検出物を含有する試料を前記光学式センサーに接触させて、当該光学式センサーから反射される光の特性を検出して作成したデーターベースを用意し、
前記凹凸構造に前記試料を接触させた後の前記光学式センサーから反射される光の特性と、前記データーベースに蓄積された情報とを比較することにより、前記溶液中に含まれる被検出物を検出することを特徴とする検出方法。
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