Development of a Piezoelectric Launcher for Efficient Loading of Nanoparticles into an Optical Trap

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/96207

Title:	Development of a Piezoelectric Launcher for Efficient Loading of Nanoparticles into an Optical Trap
Authors:	盧比奧;Ang, Jerard Vincent Rubio
Contributors:	物理學系
Keywords:	光鑷懸浮;壓電;Optical levitation;Piezoelectric;Optical tweezer
Date:	2025-01-13
Issue Date:	2025-04-09 16:58:19 (UTC+8)
Publisher:	國立中央大學
Abstract:	光鑷懸浮是一種利用光學力將奈米粒子困在真空中的技術。研究人員已將這種方法應用於各個領域，包括光機學和量子力學。具體來說，我們的目標是利用它來研究非平衡現象。然而，建構光鑷懸浮系統存在一些挑戰，其中之一是開發有效的粒子加載系統，將奈米粒子定位在聚焦光的中心。本論文描述了兩種用於加載奈米粒子的客製化發射器的設計和校正。第一種是壓電發射器，它由一個載玻片和放置在壓電材料上的蓋玻片組成。我們通過測量壓電材料產生的加速度來確定最佳驅動頻率和電壓，並且成功地將50奈米聚苯乙烯奈米粒子加載到光阱中。第二種發射器是霧化器，它將含有奈米粒子的液滴霧化到空氣中。這種技術使我們能夠加載小至25奈米的奈米粒子。我們分析測量的粒子軌跡的功率譜證實在大氣壓下，這些粒子的動力學仍然是過阻尼的。接下來，我們會將配備最佳化壓電發射器的光鑷懸浮系統放置在真空腔中。通過在這種環境中捕獲和操縱奈米粒子，我們的目標是研究它們在無阻尼條件下的動力學。;Optical levitation is a technique used to trap a nanoparticle in a vacuum by optical force. This method has been employed across various research fields, including optomechanics and quantum mechanics. In particular, we aim to utilize it to study non-equilibrium phenomena. However, constructing the optical levitation system presents several challenges, one of which is developing an effective particle loading system for launching nanoparticles into the center of focused light. This thesis presents the design and calibration of two types of homemade launchers for loading nanoparticles. The first one is the piezoelectric launcher, which consists of a glass slide with a coverslip placed on the piezoelectric material. We determine the optimal driving frequency and voltage by measuring the accelerations produced by a piezoelectric material and successfully load 50 nm polystyrene nanoparticles into the optical trap. The second launcher is a mesh nebulizer, which aerosolizes liquid droplets with nanoparticles into the air. This technique enables the loading of nanoparticles as small as 25 nm. The power spectrum analysis of the measured trajectories confirms that the dynamics of these particles remain overdamped at atmospheric pressure in the air. The next step is to place the optical levitation system, equipped with the optimized piezoelectric launcher, inside a vacuum chamber. By trapping and manipulating nanoparticles in this environment, we aim to investigate their dynamics under underdamped conditions.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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