Lateral and axial sub-diffraction imaging using photonic crystal in MID-IR

Norhan A. Salama; Mohamed A. Swillam; Shaimaa M. Alexeree; Mohamed F. O. Hameed; Salah S. A. Obayya

doi:10.1117/12.2650257

16 March 2023 Lateral and axial sub-diffraction imaging using photonic crystal in MID-IR

Norhan A. Salama, Mohamed A. Swillam, Shaimaa M. Alexeree, Mohamed F. O. Hameed, Salah S. A. Obayya

Proceedings Volume 12394, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XX; 1239405 (2023) https://doi.org/10.1117/12.2650257
Event: SPIE BiOS, 2023, San Francisco, California, United States

Abstract

Imaging with conventional optical systems has the limitation of the diffraction limit of the point spread function (PSF) where the maximum attainable resolution reaches down to half of the incident wavelength in lateral direction and down to the wavelength in axial direction. In fact, the tradeoff between the lateral and axial confinement is inevitable resulting in a deterioration of the 3D optical image. In this work, we report a metalens design attaining high resolution imaging in lateral and axial directions at 𝜆=3𝜇m. The proposed design employs a 2D square photonic crystal lattice of silicon nanorods with an engineered optical cavity and a silver slit on top of the structure. Our design exhibits a simultaneous sub-diffraction limit in lateral and axial directions reaching down to 0.38λ and to 0.8λ, respectively. The ideal PSF requires the equality of the full width at half maximum (FWHM) for both lateral and axial directions. Hence, the figure of merit (FOM) can be expressed as the ratio between the (FWHM) in lateral and axial directions approaching unity for ideal PSF. The proposed design demonstrates enhanced FOM, up to 0.47, compared to the confocal microscopy that shows FOM of 0.36. Our proposed design provides a great potential usage in the field of biomedical imaging and molecular dynamics.

Conference Presentation

Citation Download Citation

Norhan A. Salama, Mohamed A. Swillam, Shaimaa M. Alexeree, Mohamed F. O. Hameed, and Salah S. A. Obayya "Lateral and axial sub-diffraction imaging using photonic crystal in MID-IR", Proc. SPIE 12394, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XX, 1239405 (16 March 2023); https://doi.org/10.1117/12.2650257

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available