Abstract
The conventional microscope has discrete magnification and slow response time in zoom process, which is difficult to capture the dynamic activity of the live specimen. We demonstrate an adaptive microscope employing a tunable objective and a tunable eyepiece with large zooming range. The tunable objective consists of three glass lenses and four electrowetting liquid lenses. The tunable eyepiece consists of an achromatic eyepiece and an electrowetting liquid lens. The focal point between the objective and the eyepiece is designed to be tunable, which are controlled by voltages. Thus, the tuning range is relatively large. We fabricate the adaptive microscope and observe the specimen. In the experiment, the magnification of the microscope changes continuously from ~ 59.1 × to ~ 159.2 × , and the largest numerical aperture is ~ 0.212. The tunable eyepiece can release the back focal length of the tunable objective, which increases the zoom range of the microscope. No mechanical movement is required and the aberrations can be corrected over a wide wavelength range. Thus, the proposed adaptive microscope has a potential application in biological research and clinical medical examination.
Highlights
The microscope consists of a tunable objective and a tunable eyepiece, and both are composed of liquid lenses and glass lenses
(2) For the tunable eyepiece, to make the focus F2 coincide with the intermediate image plane, the focal length f2 changes with the tunable objective
We present an adaptive microscope consisting of a tunable objective and a tunable eyepiece
Summary
The focal length f1 and f2 are changed, which results in the magnification change of the proposed microscope. When the focal length f1 becomes shorter, the magnification of the tunable objective increases, and the imaging plane becomes closer to the tunable eyepiece. To make the focus F2 coincide with the intermediate image plane, the focal length f2 becomes shorter, which increases its magnification and the optical spacing. (2) For the tunable eyepiece, to make the focus F2 coincide with the intermediate image plane, the focal length f2 changes with the tunable objective. This change increases the magnification of the eyepiece and the optical spacing , increasing
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