Resonantly Enhanced Infrared Up-Conversion in Double-Step Asymmetric Subwavelength Grating Structure (Advanced Optical Materials 32/2024)

IF 8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Optical Materials Pub Date : 2024-11-14 DOI:10.1002/adom.202470099

Lal Krishna Anitha Kumari Sreekantan Nair, Jyothsna Konkada Manattayil, Jayanta Deka, Rabindra Biswas, Varun Raghunathan

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Abstract

Infrared Up-Conversion in Double-Step Asymmetric Subwavelength Grating Structure

In article number 2401070, Varun Raghunathan and co-workers study the nonlinear optical up-conversion of the mid-infrared to visible wavelength range through third-order sum-frequency generation (TSFG) process using novel double-step amorphous germanium one-dimensional sub-wavelength grating structures supporting quasi-bound states in the continuum (quasi-BIC) resonances in the mid-infrared (3–3.5 mm). One-dimensional dual step gratings on the quartz substrate are shown in the bottom part of the image. The primary (with central hole) and secondary mirrors inside the reflective objective are shown as discs (glassy brown) in the middle part. Cylindrical beams represent two mixing beams: pump (orange) and mid-infrared (pink) along with the generated TSFG signal (green). Pulses with arrows represent the incoming (illumination) and outgoing (collection) beams. The central obscuration caused by the secondary mirror is also clearly illustrated, which is the main theme of the work.

Abstract Image

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双阶非对称亚波长光栅结构中的共振增强型红外上转换（先进光学材料 32/2024）

双阶非对称亚波长光栅结构中的红外上转换在文章编号2401070中，Varun Raghunathan及其合作者利用新型双阶非晶锗一维亚波长光栅结构支持中红外（3-3.5 mm）连续体中的准束缚态（准BIC）共振，研究了通过三阶和频发生（TSFG）过程将中红外波长范围内的非线性光学上转换为可见光波长范围内的非线性光学上转换。石英基板上的一维双阶梯光栅显示在图片的下部。反射物镜内的主镜（带中心孔）和副镜在中间部分显示为圆盘（玻璃棕色）。圆柱形光束代表两种混合光束：泵浦光束（橙色）和中红外光束（粉红色），以及生成的 TSFG 信号（绿色）。带箭头的脉冲代表入射（照明）和出射（收集）光束。副镜造成的中心遮挡也清晰地显示出来，这正是这项工作的主题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS

CiteScore

13.70

自引率

6.70%

发文量

883

审稿时长

1.5 months

期刊介绍： Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.