文章信息/Info

Title:

Nano-Imaging via BaTiO3 Microsphere (n>2) Immersed inside Liquids

文章編號(hào):

1674-3962(2023)02-0162-06

作者:

李文新1; 周佩珩1; 鄧龍江1; 洪明輝2

（1. 電子科技大學(xué) 國家電磁輻射控制材料工程技術(shù)研究中心，四川 成都 611731） （2. 新加坡國立大學(xué)電子與計(jì)算機(jī)工程系，新加坡市 117576）

Author(s):

LI Wenxin1;  ZHOU Peiheng1;  DENG Longjiang1;  HONG Minghui2

（1.National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 611731, China) （2.Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore)

關(guān)鍵詞:

BaTiO3玻璃(BTG)微球; 納米成像; 浸沒; 微球輔助顯微鏡; 虛像

Keywords:

BTG microsphere;  nano-imaging;  immersion;  microsphere assisted microscope;  virtual image

分類號(hào):

O439

DOI:

10.7502/j.issn.1674-3962.202101002

文獻(xiàn)標(biāo)志碼:

A

摘要:

由于光學(xué)衍射極限的存在，傳統(tǒng)的光學(xué)顯微鏡不能分辨特征尺寸小于衍射極限的微小特征，使用范圍受限，許多研究工作者在如何打破衍射極限，提高光學(xué)顯微鏡效率方面做了大量的研究。其中，利用光學(xué)玻璃微球可以輔助傳統(tǒng)光學(xué)顯微鏡分辨小于光學(xué)衍射極限的微小特征。本研究將高折射率(n~2.2)BaTiO3玻璃(BTG)微球浸沒在不同折射率的液體中用來輔助傳統(tǒng)光學(xué)顯微鏡，以實(shí)現(xiàn)納米成像。在波長為405 nm的入射光照射下，可以很清晰地觀察到藍(lán)光光盤樣品100 nm寬的納米特征尺寸；通過調(diào)整玻璃微球與周圍介質(zhì)折射率對(duì)比度可以優(yōu)化納米成像的質(zhì)量，將BTG微球浸沒于折射率為1.46的液體中，得到的虛像質(zhì)量最好。這種高折射率微球的納米成像技術(shù)在納米光子學(xué)、生物醫(yī)學(xué)和流體領(lǐng)域有著廣泛的應(yīng)用前景。

Abstract:

Due to the existence of optical diffraction limit, the traditional optical microscope can not distinguish the tiny features smaller than the diffraction limit. And, its application scope is limited. Many researchers have conducted a lot of studies on how to break the diffraction limit and improve the efficiency of optical microscope. Among them, the optical glass microsphere can assist the traditional optical microscope to distinguish the tiny features smaller than the optical diffraction limit. In this work, high refractive index (n~2.2) BaTiO3 glass microspheres (BTG, diameter=28 μm) immersed inside liquids with different refractive indices are used to achieve nano-imaging. It provides a route to improve the property of optical microscope. A blue disk sample with a feature size down to 100 nm can be clearly observed under an incident light with wavelength of 405 nm. The nano-imaging quality and contrast can be optimized by tuning the microsphere-medium refractive index contrast. When the BTG microsphere is immersed inside the liquid with the refractive index of 1.46, the contrast of virtual image is the best. This nano-imaging of high refractive index microsphere can be widely applied in nano-photonics, biomedicine and fluid fields.