JP7684792B2 - 光変調素子、それを含むビームステアリング装置、及びビームステアリング装置を含む電子装置 - Google Patents
光変調素子、それを含むビームステアリング装置、及びビームステアリング装置を含む電子装置 Download PDFInfo
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Description
入射光の強度を増幅して位相を変調する光変調素子を提供する。
屈折率が互いに異なる2層の屈折率層が反復的に交互に積層されて形成され、第1反射率Rbを有する第1DBR層、前記第1DBR層上に設けられ、井戸層及び第1バリア層が交互に積層されて形成された積層構造の量子井戸構造を含み、前記井戸層の内部には少なくとも1つの量子点が設けられる活性層、並びに前記活性層上に設けられ、屈折率が互いに異なる2層の屈折率層が反復的に交互に積層されて形成され、第2反射率Rfを有する第2DBR層を含んでもよい。
前記第1DBR層及び前記第2DBR層の間に電流を印加し、前記活性層の屈折率及び利得を独立して調節するプロセッサをさらに含んでもよい。
前記光変調素子を複数個配置して形成した光変調素子アレイ、及び複数個の前記光変調素子の屈折率を独立して制御するように構成される制御回路を含むビームステアリング装置を提供する。
光源、前記光源から入射された光の進行方向を調節して被写体に向ける前記ビームステアリング装置、前記被写体からの光を受信するセンサ、及び前記センサが受信した光を分析するプロセッサを含む電子装置を提供することができる。
11、13、15、17 高屈折率層
100、110、120、130 第1DBR層
200、210、220、230 活性層
201、211、221、231 第1バリア層
202、212、222、232 井戸層
203、213、223、233 量子点
224 第2バリア層
300、310、320、330 第2DBR層
400、410、420、430 第1コンタクト層
500、510、520、530 第2コンタクト層
630 メタ構造物
1000、1100、1110、1120、1130、2110 光変調素子
1200 プロセッサ
2200 制御回路
2000、3110 ビームステアリング装置
2100 光変調素子アレイ
2120 基板
2300 接合部
3000 電子装置
3100 照明装置
3120 光源
3200 プロセッサ
3300 センサ
3400 メモリ
IL 入射光
OL 出力光
ST1、ST2、ST3、STn 積層構造
Claims (16)
- 入射光の強度を増幅して位相を変調する光変調素子において、
屈折率が互いに異なる2層の屈折率層が反復的に交互に積層されて形成され、第1反射率Rbを有する第1DBR層と、
前記第1DBR層上に設けられ、井戸層及び第1バリア層が交互に積層されて形成された積層構造の量子井戸構造を含み、前記井戸層の内部には、少なくとも1つの量子点が設けられる活性層と、
前記活性層上に設けられ、屈折率が互いに異なる2層の屈折率層が反復的に交互に積層されて形成され、第2反射率Rfを有する第2DBR層と、
前記第1DBR層と前記第2DBR層との間に電流を印加し、前記活性層の屈折率及び利得を独立して調節するプロセッサと、
を含み、
前記少なくとも1つの量子点のバンドギャップエネルギーは、前記井戸層のバンドギャップエネルギーよりも小さく、
前記活性層は、所定値以上の印加電流においては、飽和利得を有し、
前記プロセッサは、飽和利得以下の範囲で印加電流を変化させることにより、前記活性層の屈折率及び前記活性層の利得を調整し、
前記プロセッサは、飽和利得を超える範囲で前記活性層の屈折率を変化させることにより、前記活性層の屈折率を独立して調整する、光変調素子。 - 前記少なくとも1つの量子点は、Gs^2*Rf*Rb<1の条件を満足する単一利得Gsを有する、請求項1に記載の光変調素子。
- 前記少なくとも1つの量子点は、Gs^2>1/Rbの条件を満足する単一利得Gsを有する、請求項1に記載の光変調素子。
- 前記井戸層の内部には、複数個の量子点が設けられる、請求項1~3のいずれか1項に記載の光変調素子。
- 前記積層構造は、複数層である、請求項1~4のいずれか1項に記載の光変調素子。
- 前記活性層は、
複数層の前記積層構造を有する第1マルチ積層構造、及び複数層の前記積層構造を有する第2マルチ積層構造を含む、請求項1~5のいずれか1項に記載の光変調素子。 - 前記第1マルチ積層構造と前記第2マルチ積層構造との間には、第2バリア層がさらに設けられる、請求項6に記載の光変調素子。
- 前記第2バリア層の厚みは、前記第1バリア層の厚みよりさらに厚い、請求項7に記載の光変調素子。
- 前記量子点のバンドギャップエネルギーは、前記入射光のエネルギーと同一である、請求項1~8のいずれか1項に記載の光変調素子。
- 前記第1反射率Rbは、前記第2反射率Rfより大きい、請求項1~9のいずれか1項に記載の光変調素子。
- 前記第2DBR層上に、複数個のメタ構造物が設けられている、請求項1~10のいずれか1項に記載の光変調素子。
- 複数個の前記メタ構造物のうち少なくとも2つは、互いに異なる屈折率を有する、請求項11に記載の光変調素子。
- 請求項1~12のいずれか1項に記載の光変調素子を複数個配置して形成した光変調素子アレイと、
複数個の前記光変調素子の屈折率を独立して制御するように構成される制御回路と、を含むビームステアリング装置。 - 複数個の前記光変調素子の量子点の分布密度は、いずれも同一である、請求項13に記載のビームステアリング装置。
- 前記制御回路は、隣接した2つの光変調素子と連結される1つのCMOS素子を複数個含む、請求項13または14に記載のビームステアリング装置。
- 光源と、
前記光源から入射された光の進行方向を調節して被写体に向ける請求項13~15のいずれか1項に記載のビームステアリング装置と、
前記被写体からの光を受信するセンサと、
前記センサが受信した光を分析するプロセッサと、を含む電子装置。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2019-0116875 | 2019-09-23 | ||
| KR1020190116875A KR102745348B1 (ko) | 2019-09-23 | 2019-09-23 | 광 변조 소자, 이를 포함하는 빔 스티어링 장치 및 빔 스티어링 장치를 포함하는 전자 장치 |
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| JP2021051295A JP2021051295A (ja) | 2021-04-01 |
| JP7684792B2 true JP7684792B2 (ja) | 2025-05-28 |
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| Publication number | Publication date |
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| CN112542768A (zh) | 2021-03-23 |
| US20220308369A1 (en) | 2022-09-29 |
| US11402670B2 (en) | 2022-08-02 |
| CN112542768B (zh) | 2025-11-04 |
| EP3796072A1 (en) | 2021-03-24 |
| EP3796072B1 (en) | 2022-01-19 |
| US20210088813A1 (en) | 2021-03-25 |
| KR20210035377A (ko) | 2021-04-01 |
| US12140824B2 (en) | 2024-11-12 |
| KR102745348B1 (ko) | 2024-12-23 |
| JP2021051295A (ja) | 2021-04-01 |
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