## 1 Introduction  
Microring resonators (MRRs) are vital photonic components in the development of high-index silicon photonic platforms. It produces optical resonance by utilizing the constructive interference phenomenon from the interaction between propagated light in its waveguides [1; 2; 3]. The MRR waveguide consists of a ring and a straight waveguide that interact in the presence of light propagation, provided that the distance or gap between them is small, usually in micro or nanometer sizes [4; 5]. They are highly sought after due to several advantages such as fast modulation, enabling spectral filtering, compact sizes, and flexibility in structures. Silicon is the material of choice to fabricate MRRs, as advanced silicon technology, especially in electronic industries, has made it possible to design MRRs at a relatively low cost [6]. Recent developments in the field of MRRs have led to a renewed interest in optical sensing applications, especially in the biomedical field [7]. It has been reported that MRRs have the ability to produce an integrated sensing device with high sensitivity that allows detection of ultra-low molecule concentration [8; 9]. Moreover, there are reports on label-free MRRs based sensors, which makes them highly attractive as advanced biomedical instrumentations, either invasive or noninvasive [10; 11; 12]. MRR-based sensors also have applications in various fields such as clinical analysis, substance detection in food, health, and environment monitoring [13; 14; 15]. Diabetes is one of the major health problems globally, with more than 400 million people affected [16]. Diabetes is a condition of excessive glucose levels in the blood [17]. Glucose, C\({}_{6}\)H\({}_{12}\)O\({}_{6}\), is classified as a carbohydrate from the monosaccharide subcategory, which is the most important energy source for metabolism processes [18; 19]. Diabetes is often closely associated with a variety of other medical conditions such as celiac disease, cystic fibrosis, tuberculosis, and heart attacks [20]. Complications from various types of diseases caused by diabetes can lead to blindness, kidney failure, amputation, cardiovascular diseases, and even cancer [21]. A study conducted by the American Diabetes Association (2017) states that diabetes can be diagnosed from the amount of glucose in the blood, as shown in Table 1[22]. A person can be diagnosed with diabetes if there is more than 0.13% of glucose in the blood. In this work, the focus is to measure the sensitivity of MRR-based sensors in detecting the glucose range of diabetics. Thus, the detected glucose levels are in the range of 0.13-0.40%, with changes in glucose levels of 0.09%. Although the glucose percentage in a diabetic person is relatively low, it is crucial to have a system that has the ability to detect its presence in order to prevent the adverse effects that may come later. Previous research on MRR-based sensors has only focused on the performance of sensors for glucose detection [23; 24; 25]. In this paper, we report the design and characterization of MRR-based sensors to detect and subsequently predict diabetic glucose levels. The mechanism of MRR-based sensors occurs on its surface, which then provided specific processing. This specific processing occurs due to the analyte binding on the surface element, which leads to refractive index changes and a resonance shift. The presence of glucose molecules at very low levels can still change the value of the refractive index so that it causes a shift in resonance. Thus, MRR-based sensors have a high potential to be used as a low-concentration glucose detection sensor. Initially, a sensitivity simulation of MRR-based sensors was performed to detect the glucose levels in diabetic patients. The MRR device was then fabricated using Electron Beam Lithography (EBL) and a negative tone hydrogen silsesquioxane (HSQ) resist mask. Characterization of the device was carried out by using an optical spectrum analyzer (OSA) and tunable laser source (TLS) to measure the quality factor, Q.